I’m glad to hear it’s on your to-do list! I hope you do see fit to implement the MS tags too, it looks like a similar structure so it might not be too much work to support the different tag names and namespaces.

In the meantime, I’ve been using exiftool with -s "-Subject<RegionPersonDisplayName" -out %d%f.xmp *.jpg to run through them all extracting the names into tags in sidecar .xmp files. If you do add support, I can then just delete those xmp’s!