No - the truth is there are no boundaries, no expectations and no requirements.
It could be one word or a hundred verses.
Written in the first or second or even third person perspective.
The point is to get the thoughts out of your head.
It doesn’t matter what anyone thinks, most people interpret the same piece of writing in a hundred different ways.
Some find it easier to write empathetically whilst others only right from their own experience.
Don’t over think it - just do it.