The common task is to have an editable input with the list of objects that refer to the current object.
To do that we usually mimic the Reference Set Selectors using a regular grid, 3-4 microflows and a custom Select Page.
Allowing a custom datasource (a microflow) in a Reference Set Selector would be a good start. Also, we need to send the results from the regular Select Page to another microflow to update the associations when the “Select Button” widget is clicked.