Custom code. Read Firestore database from DocumentReferene and return field in collection

Database & APIs

I have to create a Custom Code where I read a special field in a firebase collection based on a documentReference, but I can't get it to work.

So what I want is to read a field called "uppdragAdress" in collection "uppdragLista"

What have you tried so far?

have tried everything

Did you check FlutterFlow's Documentation for this topic?
Yes