Transcoding HDR is problematic if your GPU doesn't support 10-bit HEVC. Also, do you mean DV8? Because DV8 "falls back" to HDR10 if the device can't do DV8.
Jellyfin 10.10.6 (Docker)
Ubuntu 24.04.2 LTS w/HWE
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
4x WD Red Pro 6TB CMR in RAIDZ1