Suggestions for features and software you would like to see in DietPi, goes here.
I made it possible for jellyfin to transcode using GPU with VAAPI. So I think I should let you know my experience.
Originally, I just want to setup a ffmpeg-webui (https://github.com/Sub-7/FFmpegUI), and this script offers an hardware-acceleration-option with VAAPI, I just ran the script and found that I can transcode movies through the webui using gpu fastly. When transcoding, I noticed that the cpu consuming is low in htop and gpu consuming is high in intel_gpu_top.
After that, I found that my jellyfin could use hardware transcoding normally. My device is an intelNUC.
I will be glad if this can help you a little