A bit late to the party, but as far as I know only vGPU stuff reported working on unraid is intel iGPU up to 10th gen. The later intel iGPUs moved tovards SR-IOV but support in drivers has never been implemented. (should be working in Q4 2023 https://github.com/intel/linux-intel-lts/issues/33)
There is a way to make vGPUs work with nVidia GTX 1000 and RTX 2000 series, craft computing made videos, there is a discord group https://discord.gg/cWx6VBXqbD. Those vGPUs might be used together with gamestream and moonlight client for best RDP experience.
Maor's post in UNRAID and Nvidia A40 SR-IOV was marked as the answer