IBM Security QRadar

How can I use the ArielSearch API in QPYLib to query domains, URL and other related information. Currently, my api_version is v20.0, and the fields that can be queried are as follows:

/ariel/searches/{search_id}:

{
  "cursor_id": "35822d91-02aa-44b8-b1d3-603e909b961b",
  "status": "COMPLETED",
  "compressed_data_file_count": 0,
  "compressed_data_total_size": 0,
  "data_file_count": 0,
  "data_total_size": 0,
  "index_file_count": 60,
  "index_total_size": 491849,
  "processed_record_count": 0,
  "desired_retention_time_msec": 86400000,
  "progress": 100,
  "progress_details": [],
  "query_execution_time": 12,
  "query_string": "SELECT * FROM events WHERE logsourceid in (167) LIMIT 2000000 START ('2024-05-28 01:00') STOP ('2024-05-28 02:00')",
  "record_count": 0,
  "size_on_disk": 24,
  "save_results": false,
  "completed": true,
  "subsearch_ids": [],
  "snapshot": null,
  "search_id": "35822d91-02aa-44b8-b1d3-603e909b961b"
}

and the result api retured:

{
  "events": [
    {
      "starttime": 1716801297718,
      "protocolid": 255,
      "sourceip": "10.43.176.219",
      "logsourceid": 167,
      "qid": 1004750002,
      "sourceport": 0,
      "eventcount": 1,
      "magnitude": 6,
      "identityip": "0.0.0.0",
      "destinationip": "58.221.49.81",
      "destinationport": 80,
      "category": 19040,
      "username": null
    }]
}

In addition, I mapped the original log fields in the log source to the newly added DemoDomain field in DSM through the DSM editor.

I want to get the custom DemoDomain field by SDK ariel API. But the returned fields dont't contain DemoDomain field.  How can I do?