Following repo on Github contains an ad hoc datasource that reads DOM data: https://github.com/orgs/SkylineCommunications/repositories?language=&q=GQIDS&sort=&type=all
More specifically you can find some code here which uses the DomHelper to fetch instances: https://github.com/SkylineCommunications/SLC-GQIDS-DomUpdates/blob/main/DomUpdates_1/DomUpdates_1.cs
Please note: This datasource has been designed to implement the forthcoming real-time ad hoc updates feature, which is not yet available.
Hope this helps!
Best regards, Ward