Filter to specific family and create Family Dropdown

I am creating a sheet and I need a title block. I would like the user to be able to select a title block from the list. At the moment, I can find the name of the title block in Family Type node, but it also gives me a tons of other families. Is there a way to filter that, so the dropdown shows only title blocks and output that as a FamilyType to feed Sheet.ByName… node?
I am struggling to find a solution.

@pablo102 ,

Check out Datashapes! you work out your personal interface

These are interesting but they wont give me Elements.FamilyType as output

You have to build the list of title block types yourself.