Properties Panel Ajax Call

Hello everyone,

I want to add a Select Box to the Properties Panel by making an Ajax call to the URL from which I receive the data and fill the box. Unfortunately, I get the error message

Cannot read property ‘ajax’ of undefined
in my code. This is my code:

import {EntryFactory, IPropertiesProvider} from '../bpmn-js/bpmn-js';
import  {$, jQuery} from "jquery";

export class CustomPropsProvider implements IPropertiesProvider{

  static $inject = ['translate', 'bpmnPropertiesProvider'];
  

// Note that names of arguments must match injected modules, see InjectionNames.
  constructor(private translate, private bpmnPropertiesProvider) {
    /** 
    var http = new XMLHttpRequest();
    http.onreadystatechange=function(){
      if(http.readyState == XMLHttpRequest.DONE){
        alert(http.responseText);

      }
      console.log(http.responseText);
    http.open("GET", "test", true);
  http.send();}
  */
  }
 
  getTabs(element) {
    return this.bpmnPropertiesProvider.getTabs(element)
      .concat({
        id: 'custom',
        label: this.translate('Custom'),
        groups: [
          {
            id: 'customText',
            label: this.translate('customText'),
            entries: [
              EntryFactory.textBox({     
                id: 'custom',
                label: this.translate('customText'),
                modelProperty: 'customText'
              }),
              EntryFactory.selectBox({
                id : 'example',
                description : 'example desc',
                label : 'example',
                options:[],
                selectOptions: function(element){ 
                  var options = [];
                  jQuery.ajax({
                    url:{http://example.org,
                    function(result){
                      options = result;
                    },
                    async: false
                  }});
                  return options;},
                  setControlValue: true,
                modelProperty : 'example'
              })
        ]}]
      })
  }
}

Thank you in advance:)

Seems to be a matter of importing jQuery, so maybe not 100% related to the properties panel.

For further assistance, please share a CodeSandbox that reproduces your issue in a way that we can inspect it.