I've been using my MiniLED monitor (Acer XV275K P3) in HDR mode with Plasma 6 on NixOS with an AMD RX 7600. It works well, HDR content is displayed nicely and SDR content is tonemapped pretty well imo.
It can be a little weird setting up the vk_hdr_layer for mpv, and running games inside Gamescope, but once it works then it looks as good as on Windows I believe.