Here's an annotated screenshot of what I'd like to be able to do:

Basically, it would be really convenient to be able to duplicate the HP bars of people in my group who I'm actually actively levelling with, and also in the duplicate add a "heal" button which I can click when I want to heal them (as I usually fill a support role). This is so I can avoid having to split my attention between the left and right hand side of the screen, which can get quite mentally exhausting.
Is this even something that's possible, and if so how would I go about doing it?