How do I implement embedded Java language in XML document (in a vscode extension)?

I've read docs on https://code.visualstudio.com/api/language-extensions/embedded-languages but still wondering if it's possible to reuse vscode-java language server to provide intellisense/autocomplete features for Java/BeanShell code imbedded in XML like:

<!DOCTYPE Rule PUBLIC "sailpoint.dtd" "sailpoint.dtd">
<Rule language="beanshell" name="">
<Description></Description>
<Source><![CDATA[
  import java.util.Map;

  private Map putInMap(String s1, String s1){
    Map data = new HashMap();
    data.put("first", s1);
    data.put("second", s2);
    return data;
  }
  return putInMap("foo", "bar");
]]></Source>
</Rule>

I guess I don't need to reimplement my own language server from scratch (though BeanShell is not strictly Java, but some reduced version of it) and can refer to the existing Java server from vscode-java. Any suggestions/samples?

埋め込み言語のドキュメントと、issue で説明されている vscode-java language-server 統合から始めてください。既存のサーバーを XML CDATA 内の Java または BeanShell に再利用できるかどうかを確認します。文書化されたサポート対象のアプローチ、または明確な制限が示されれば完了とします。できればサンプルも用意してください。