Hi,
The domain model which showed in the documentation was an example to show, as widget builds it has data sources as below
Select microflow option and click on select , choose a folder to keep your microflow on clicking new can define the name of microflow.
You can choose one of this based on your requirement. if its Microflow or Nano flow its should return a list of Entity’s which has generalization of image.
For customisation there are few options you can try. For image content either you can keep a text or variable based on need.
Hope this helps!