It is possible to specify or configure a custom datasource to load the select-options for a particular Data definition for Dynamic Data list?
The following image might clarify what I need to do:

Will it be possible that when the Dynamic Data form is shown to the User the values come from any of the liferay tables like User_, Group_ etc or from any custom plugin portlet's DB table etc.
Thanks
P.S.: Also posted on liferay forum: https://www.liferay.com/community/forums/-/message_boards/message/50483965