How to add a 2nd rating in Performance Form Overall Rating: DFF?

I am trying to add a field on the Performance Form that will represent a 2nd rating.

I tried to add a second rating model but looks as if you can only use 1 and I tried creating a DFF for the forms which forces a new Additional Info Section.
I am looking for this to be a field (rating or dff) right next to the current model rating.