I got my OLED yesterday and so far all three HDR games I’ve tested (Tetris Effect, THPS1&2 and modded Control) won’t allow HDR to be enabled. I cant see any workarounds for them so far either. Hopefully this will be improved with time, but as a start it seems HDR support is about as annoying as it is on desktop PC!
Give it a year or atleast a few months before theres an AUTO HDR feature release on linux