To recap on how I did this on a similar CPU with Ubuntu and on OMV.
Install linuxserver/jellyfin docker (It does the HW transcoding config for you)
set up your media folders
Set up Jellyfin to use VAAPI - disable QuicSync (hard to get going and if VAAPI works then little need)
Optional step - install vainfo on base system to confirm encoding/decoding capabilities of your Intel chip.
Find a 10 bit HEVC file and play it. Open an HTOP window to see what's happening - this will tell if HW transcoding is working.
Optional step - install intel_gpu_top and run it - this will tell if HW transcoding is working.