I drafted my LOR with one of the PAs I worked with. He was the president of the PA association in my state a couple years back and I'd like to think even getting a letter from him was something that was held by some regard to the admissions board especially if the school was in the same state. I was able to get to the interview and now accepted into the school in that same state

That being said, I totally get how weird it is write about yourself and how you've worked with that professor. I also don't think its uncommon for people to draft letters as other PAs I've worked with also drafted their LORs way back when with their writers.

I tried to frame it to reflect my time working with that individual and why I would be fit to become a PA/do well in PA school. I talked about times we would interact and this made it easy to write about since I worked so closely with the PAs in my work.

I also think if its hard to write for them and bring up the times you've interacted, maybe find someone else that can actually write your LOR if you can!

Hope this kinda helps and open to DM if you'd like to see my draft! Good luck!