HEVC playback high GPU usage

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I would say this is not a Jellyfin question. The problem is upstream (with your Servarr setup). The golden rule is to match your media to your clients, and it sounds as though your client can't handle HEVC. You will need to figure out how to avoid HEVC media in your collection, but hardware acceleration is functioning properly and there's not a way to throttle transcoding in the way you've requested. You can check out the Throttle Transcodes setting, but all that will do is pause transcoding once enough has been transcoded to play a section of the media, it will not reduce the GPU usage.

Your direction needs to be Sonarr and Radarr. I would start with *figuring out how to avoid HEVC. The other option is a different client that supports HEVC, which could be simple as well.