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The others gave you a solution but note the following:
Jellyfin in a VM means that once you passthrough the GPU to the VM, you will lose graphical capabilities on the host. That could be a dealbreaker. Segmenting the GPU is inefficient.
I host my Jellyfin in a LXC because I can passthrough the GPU without reserving it to the LXC.
So, open a terminal and check if the device is there on your system?
It's frustrating. I don't know what else to do.
Follow the excellent Jellyfin documentation for hardware-transcoding.
The /dev/dri doesnt magically appear when you run Jellyfin inside a VM. You should also ask /r/Proxmox if you need help to passthrough your device to the VM.