Seems you can search by rating in immich: github.com/immich-app/immich/discussions/11777

Though you can’t use greater than, less than, etc., or sort by rating.

If you’re willing to use something designed for porn, you can use stash: github.com/stashapp/stash It can definitely do those, though I’m not sure if it imports existing metadata. You can probably script that. It doesn’t scream “this is for porn” in its interface, either, you might not even notice in brief use. The most sexual thing in its interface is two metadata labels it has, “last O at” and “O count”.