How to use Select2 for getting data from another module

I want to get the data of an OpenContent Razor template called our team to use in a handlebars template. When I investigate the POST request the respons is [ ]. The author object in the options.json looks like:

"Author": {
  "type": "select2",
  "dataService": {
    "data": {
      "moduleId": "495",
      "tabId": "107",
      "valuefield": "Id",
      "textfield": "Name"
    },
    "action": "Lookup"
  }
},

If I investigate the POST request in the console the response keeps empty, which result in an empty dropdown list.

How can I receive the right data?