In Notion, it doesn't seem possible to create a new database item with a relation to a different database?

My workflow looks for a new entry in database A then subsequently creates an item in database B. I have an existing relationship that I want to use to relate the item in database B with the item in database A. Unfortunately, it looks like this isn’t possible? I don’t see in the list of available fields the ability to use relationship property types.

Am I missing something?