The new Stalker game seems to be running just fine on steam if ProtonDB is anything to go by. Nevertheless, I’d prefer to purchase the game on GOG and unfortunately I have yet to see any posts anywhere about how that version runs via Lutris as an example. I don’t expect there to be any issues but it would be nice to hear from people who’ve attempted to play it that way. Cheers.
I usually use the “add non-steam games” utility with the game’s executable and then modify the compatibility options of the added game.