diff --git a/ecocode-rules-specifications/pom.xml b/ecocode-rules-specifications/pom.xml
index 5811cddb5..df1c19316 100644
--- a/ecocode-rules-specifications/pom.xml
+++ b/ecocode-rules-specifications/pom.xml
@@ -14,6 +14,21 @@
 	<description>Repository that contains the specifications of every static-analysis rules available in ecoCode plugins.</description>
 	<url>https://github.com/green-code-initiative/ecoCode/tree/main/ecocode-rules-specifications</url>
 
+	<dependencies>
+		<dependency>
+			<groupId>com.googlecode.json-simple</groupId>
+			<artifactId>json-simple</artifactId>
+			<version>1.1.1</version>
+			<optional>true</optional> <!-- Do not expose this dependency to children -->
+			<exclusions>
+				<exclusion>
+					<groupId>*</groupId>
+					<artifactId>*</artifactId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+	</dependencies>
+
 	<build>
 		<plugins>
 			<plugin><!--
diff --git a/ecocode-rules-specifications/src/main/script/PrepareResources.jsh b/ecocode-rules-specifications/src/main/script/PrepareResources.jsh
index 04f15b3f6..8f8c154ea 100644
--- a/ecocode-rules-specifications/src/main/script/PrepareResources.jsh
+++ b/ecocode-rules-specifications/src/main/script/PrepareResources.jsh
@@ -1,5 +1,9 @@
 //usr/bin/env jshell -v "$@" "$0"; exit $?
 
+import org.json.simple.JSONObject;
+import org.json.simple.parser.JSONParser;
+import org.json.simple.parser.ParseException;
+
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -37,7 +41,7 @@ import static java.util.Optional.of;
         @Override
         public void run() {
             getResourcesToCopy().forEach(rule -> {
-                copyFile(rule.metadata, rule.getMetadataTargetPath(targetDir));
+                mergeAndCopyFile(rule.metadata, rule.specificMetadata, rule.getMetadataTargetPath(targetDir));
                 copyFile(rule.htmlDescription, rule.getHtmlDescriptionTargetPath(targetDir));
             });
         }
@@ -55,6 +59,37 @@ import static java.util.Optional.of;
             }
         }
 
+        private void mergeAndCopyFile(Path source, Path merge, Path target) {
+            if (Files.isRegularFile(merge)) {
+                LOGGER.log(DEBUG, "Merge: {0} and {1} -> {2}", source, merge, target);
+                try (
+                    FileReader sourceReader = new FileReader(source.toFile());
+                    FileReader mergeReader = new FileReader(merge.toFile())
+                ) {
+                    JSONParser parser = new JSONParser();
+                    JSONObject sourceJson = (JSONObject) parser.parse(sourceReader);
+                    JSONObject mergeJson = (JSONObject) parser.parse(mergeReader);
+                    mergeJsonObjects(sourceJson, mergeJson);
+                    Files.write(target, sourceJson.toString().getBytes());
+                } catch (IOException | ParseException e) {
+                    throw new RuntimeException("cannot process source " + source, e);
+                }
+            } else {
+                copyFile(source, target);
+            }
+        }
+
+        private void mergeJsonObjects(JSONObject object1, JSONObject object2) {
+            object2.forEach((key, value) -> {
+                Object element = object1.get(key);
+                if (element instanceof JSONObject && value instanceof JSONObject) {
+                    mergeJsonObjects((JSONObject) element, (JSONObject) value);
+                } else {
+                    object1.put(key, value);
+                }
+            });
+        }
+
         private void copyFile(Path source, Path target) {
             LOGGER.log(DEBUG, "Copy: {0} -> {1}", source, target);
             try {
@@ -79,6 +114,7 @@ import static java.util.Optional.of;
                 }
                 final String ruleKey = matcher.group("ruleKey");
                 final Path metadata = htmlDescription.getParent().getParent().resolve(ruleKey + ".json");
+                final Path specificMetadata = htmlDescription.getParent().resolve(ruleKey + ".json");
 
                 if (!Files.isRegularFile(htmlDescription) || !Files.isRegularFile(metadata)) {
                     return empty();
@@ -87,18 +123,21 @@ import static java.util.Optional.of;
                 return of(new Rule(
                         matcher.group("language"),
                         htmlDescription,
-                        metadata
+                        metadata,
+                        specificMetadata
                 ));
             }
 
             private final String language;
             private final Path htmlDescription;
             private final Path metadata;
+            private final Path specificMetadata;
 
-            Rule(String language, Path htmlDescription, Path metadata) {
+            Rule(String language, Path htmlDescription, Path metadata, Path specificMetadata) {
                 this.language = language;
                 this.htmlDescription = htmlDescription;
                 this.metadata = metadata;
+                this.specificMetadata = specificMetadata;
             }
 
             Path getHtmlDescriptionTargetPath(Path targetDir) {