For Windows, see [Plex Media Server] Forum Preview for Tonemapping on Windows with Intel iGPUs .
The preview supports hardware accelerated tone mapping when running PMS on Windows based systems.
The encode is still to H.264 8-bit.
Note that Alder Lake N CPUs, such as the N100, are awaiting an Intel driver update (see first post).
Plex is looking for volunteers to test the new drivers: [Plex Media Server] Forum Preview for Tonemapping on Windows with Intel iGPUs - #181 by chris_decker08