Best way to use Topas photo AI on film negatives photo'd in raw

I’m impressed how well Photo AI works. But I have one question:
I have a lot of my father’s negatives, mostly black and white. instead of scanning I have photo’d them in raw. I use Lightroom so I have reversed them in LR by flipping the tone curve. But if I want to use Photo AI on the raw picture I need to first convert my negative (Sony ARW file) to a positive picture (ARW or DNG I guess). If I use Photo AI on the negatives (raw files) it works but it does not detect faces and motives.