Possible to retrieve and reference a list of data types (types of things)?

For some admin functions I’d like to fill a dropdown with a list that shows all or a selection of data types. Then I want to be able to select from that dropdown and fill an RG with all of the things in that data type. Is that remotely possible in Bubble’s editor?

As elements are defined on what type of thing they contain, it seems like I would need the ability to modify the element definition and dynamic data isn’t allowed there.