Hardware transcoding in Jellyfin: no GPU visable?

I’m new to TrueNas, so bare with me.

I spend this afternoon searching the web for anything that resembles my issue, to no avail. So I hope i don’t missed any posts.
It all sounds so simple…

I come from a Synology with Jellyfin running in container and preforming HW-transcoding on the intergrated GPU.
This created bottleneck issues, especially on 4K content.

I now got my friends old pc with the following specs:
CPU: Intel Core i7-4790K
GPU: Asus GTX750TI-OC-2GD5 (GeForce GTX 750 Ti)
Mobo: Asus Z97-K
Pool: WD6003FFBX (4x 6TB)
SSD: Gigabyte GP-GSM2NE3512GNTD

I especially was looking forward to a dedicated GPU for when transcoding multiple (4K) streams.

I installed TrueNas on the SSD and created a pool, users, SMB, etc…
Works perfectly!
But when installing the Jellyfin app, i was confronted with (Both!) the intel and the nvidia dropdown was empty (see screenshot)

I checked the Shell with nvidia-smi and this was the output:

admin@truenas[~]$ nvidia-smi
Thu Aug  8 17:39:02 2024       
+---------------------------------------------------------------------------------------+
| NVIDIA-SMI 545.23.08              Driver Version: 545.23.08    CUDA Version: 12.3     |
|-----------------------------------------+----------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |         Memory-Usage | GPU-Util  Compute M. |
|                                         |                      |               MIG M. |
|=========================================+======================+======================|
|   0  NVIDIA GeForce GTX 750 Ti      Off | 00000000:01:00.0 Off |                  N/A |
| 33%   44C    P0               1W /  38W |      0MiB /  2048MiB |      0%      Default |
|                                         |                      |                  N/A |
+-----------------------------------------+----------------------+----------------------+
                                                                                         
+---------------------------------------------------------------------------------------+
| Processes:                                                                            |
|  GPU   GI   CI        PID   Type   Process name                            GPU Memory |
|        ID   ID                                                             Usage      |
|=======================================================================================|
|  No running processes found                                                           |
+---------------------------------------------------------------------------------------+

It looks like TrueNas does recognize the GPU but does not want to share it…

Aslo, when i navigate to System Settings → Advanced → Isolated GPU Device(s) → Configure, i can choose the GPU from the drop-down, but notifies me with the following message:

> At least 1 GPU is required by the host for its functions.
> With your selection, no GPU is available for the host to consume.

Like, it doesn’t consider the intel iGPU for TrueNas.
I don’t know if these two are related though…

Any help is much appreciated!

TL;DR:
TrueNas doesn’t give me a GPU option on installing (or configuring) Jellyfin.
TrueNas looks like it does recognize the GPU though.