Good question, sometimes the process dataset contains this in the description, but if you do this on the database / process level, it is typically somewhat messy. If you use libraries, this is very easy (as the library name is the database). If you want to stick to the "classic" process / database import, you could modify the first database (where you import into) e.g. by modifiying the description:
sql: update tbl_processes set description = description || ', from first_database.'
And then import the next database into this.
