Schema Reference Usage

[bliu13]

Hi, I am trying to figure out how to use the schema reference functionality that was merged into v3.3.0. I don't see any documentation and the SchemaRegistry.d.ts file doesn't seem to show any option for uploading schemas that reference other schemas, but I do see functions for:

private getreferencedSchemas;
private getreferencedSchemasRecursive;
getreferencedSchemasFromReference(reference: SchemaReference, helper: SchemaHelper, referencesSet: Set<string>): Promise<ConfluentSchema[]>;

How do I upload schemas that reference other schemas?