diff --git a/components/IdentifyViewer.jsx b/components/IdentifyViewer.jsx
index 5438ad67a..1e898856f 100644
--- a/components/IdentifyViewer.jsx
+++ b/components/IdentifyViewer.jsx
@@ -314,7 +314,7 @@ class IdentifyViewer extends React.Component {
         this.export({[layer]: [result]});
     };
     export = (json, clipboard = false) => {
-        const exporter = [...BuiltinExporters, ...this.props.customExporters].find(entry => entry.id === this.state.exportFormat);
+        const exporter = this.getExporters().find(entry => entry.id === this.state.exportFormat);
         if (exporter) {
             if (!this.props.exportGeometry) {
                 json = Object.entries(json).reduce((res, [layerId, features]) => (
@@ -422,9 +422,7 @@ class IdentifyViewer extends React.Component {
                     );
                 });
             }
-            if (this.props.attributeCalculator) {
-                rows = rows.concat(this.props.attributeCalculator(layer, result));
-            }
+            rows.push(...this.computeExtraAttributes(layer, result));
             if (featureReportTemplate) {
                 rows = rows.concat(
                     <tr key="__featurereport">
@@ -450,7 +448,7 @@ class IdentifyViewer extends React.Component {
             extraattribs = (
                 <div className="identify-result-box">
                     <table className="attribute-list"><tbody>
-                        {this.props.attributeCalculator ? this.props.attributeCalculator(layer, result) : null}
+                        {this.computeExtraAttributes(layer, result)}
                         {featureReportTemplate ? (
                             <tr>
                                 <td className={"identify-attr-title " + this.props.longAttributesDisplay}>
@@ -528,7 +526,8 @@ class IdentifyViewer extends React.Component {
             );
         }
         // "el.style.background='inherit'": HACK to trigger an additional repaint, since Safari/Chrome on iOS render the element cut off the first time
-        const clipboardExportDisabled = ([...BuiltinExporters, ...this.props.customExporters].find(entry => entry.id === this.state.exportFormat) || {}).allowClipboard !== true;
+        const exporters = this.getExporters();
+        const clipboardExportDisabled = exporters.find(entry => entry.id === this.state.exportFormat)?.allowClipboard !== true;
         return (
             <div className="identify-body" ref={el => { if (el) el.style.background = 'inherit'; } }>
                 {body}
@@ -537,12 +536,7 @@ class IdentifyViewer extends React.Component {
                         <span className="identify-buttonbox-spacer" />
                         <span>{LocaleUtils.tr("identify.exportformat")}&nbsp;</span>
                         <select className="combo identify-export-format" onChange={ev => this.setState({exportFormat: ev.target.value})} value={this.state.exportFormat}>
-                            {Object.values(BuiltinExporters).filter(entry => {
-                                return !Array.isArray(this.props.enableExport) || this.props.enableExport.includes(entry.id);
-                            }).map(entry => (
-                                <option key={entry.id} value={entry.id}>{entry.title ?? LocaleUtils.tr(entry.titleMsgId)}</option>
-                            ))}
-                            {Object.values(this.props.customExporters).filter(entry => {
+                            {exporters.filter(entry => {
                                 return !Array.isArray(this.props.enableExport) || this.props.enableExport.includes(entry.id);
                             }).map(entry => (
                                 <option key={entry.id} value={entry.id}>{entry.title ?? LocaleUtils.tr(entry.titleMsgId)}</option>
@@ -555,6 +549,37 @@ class IdentifyViewer extends React.Component {
             </div>
         );
     }
+    computeExtraAttributes = (layer, result) => {
+        const rows = [];
+        Object.values(window.qwc2.__attributeCalculators || {}).forEach((calc, idx) => {
+            const row = calc(layer, result);
+            if (row.length === 2) {
+                rows.push((
+                    <tr key={"custom-attr-" + idx}>
+                        <td className="identify-attr-title"><i>{row[0]}</i></td>
+                        <td className="identify-attr-value">{row[1]}</td>
+                    </tr>
+                ));
+            } else if (row.length === 1) {
+                rows.push((
+                    <tr key={"custom-attr-" + idx}>
+                        <td colSpan="2">{row[0]}</td>
+                    </tr>
+                ));
+            }
+        });
+        if (this.props.attributeCalculator) {
+            rows.push(...this.props.attributeCalculator(layer, result));
+        }
+        return rows;
+    };
+    getExporters = () => {
+        return [
+            ...BuiltinExporters,
+            ...this.props.customExporters,
+            ...Object.values(window.qwc2.__identifyExportes || [])
+        ];
+    };
     setIframeContent = (iframe, html) => {
         if (iframe.getAttribute("identify-content-set")) {
             return;
diff --git a/components/PluginsContainer.jsx b/components/PluginsContainer.jsx
index 62eac5265..0d9dcab14 100644
--- a/components/PluginsContainer.jsx
+++ b/components/PluginsContainer.jsx
@@ -27,7 +27,7 @@ class PluginsContainer extends React.Component {
     renderPlugins = (pluginsConfig) => {
         const allPlugins = {
             ...this.props.plugins,
-            ...(window.qwc2?.customPlugins ?? {})
+            ...(window.qwc2?.__customPlugins ?? {})
         };
         return pluginsConfig.map((pluginConf, idx) => {
             const Plugin = allPlugins[pluginConf.name + "Plugin"];
diff --git a/package.json b/package.json
index 4843aa25f..42a58c28b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "qwc2",
-    "version": "2024.04.16-master",
+    "version": "2024.04.18-master",
     "description": "QGIS Web Client 2 core",
     "author": "Sourcepole AG",
     "license": "BSD-2-Clause",
diff --git a/plugins/API.jsx b/plugins/API.jsx
index af4e3e98e..ea6786f4d 100644
--- a/plugins/API.jsx
+++ b/plugins/API.jsx
@@ -145,8 +145,11 @@ import VectorLayerUtils from '../utils/VectorLayerUtils';
  */
 class API extends React.Component {
     componentDidMount() {
-        window.qwc2 = {};
-        window.qwc2.customPlugins = {};
+        window.qwc2 = {
+            __customPlugins: {},
+            __attributeCalculators: {},
+            __identifyExportes: {}
+        };
         // Auto-binded functions
         for (const prop of Object.keys(this.props)) {
             window.qwc2[prop] = this.props[prop];
@@ -155,6 +158,10 @@ class API extends React.Component {
         window.qwc2.LayerRole = LayerRole;
         window.qwc2.addPlugin = this.addPlugin;
         window.qwc2.removePlugin = this.removePlugin;
+        window.qwc2.addIdentifyAttributeCalculator = this.addIdentifyAttributeCalculator;
+        window.qwc2.removeIdentifyAttributeCalculator = this.removeIdentifyAttributeCalculator;
+        window.qwc2.addIdentifyExporter = this.addIdentifyExporter;
+        window.qwc2.removeIdentifyExporter = this.removeIdentifyExporter;
         window.qwc2.addExternalLayer = this.addExternalLayer;
         window.qwc2.drawScratch = this.drawScratch;
         window.qwc2.drawGeometry = this.drawGeometry;
@@ -251,7 +258,19 @@ class API extends React.Component {
     };
     removePlugin = (name) => {
         this.props.unregisterCustomPlugin(name);
-        delete window.qwc2.customPlugins[name];
+        delete window.qwc2.__customPlugins[name];
+    };
+    addIdentifyAttributeCalculator = (name, calcFunc) => {
+        window.qwc2.__attributeCalculators[name] = calcFunc;
+    };
+    removeIdentifyAttributeCalculator = (name) => {
+        delete window.qwc2.__attributeCalculators[name];
+    };
+    addIdentifyExporter = (name, exporterConfig) => {
+        window.qwc2.__identifyExportes[name] = exporterConfig;
+    };
+    removeIdentifyExporter = (name) => {
+        delete window.qwc2.__identifyExportes[name];
     };
     addExternalLayer = (resource, beforeLayerName = null, sublayers = true) => {
         const params = LayerUtils.splitLayerUrlParam(resource);