Ok, found a solution.
Seems there is nothing I could do via cli or xo-ce to see the virtual GPUs, had to install xcp-ng center, specifically from:
https://github.com/xcp-ng/xenadmin/files/13800584/XCP-NG-Center-2023-Release.zip
Using the center, I was able to assign the GPU to the VM and everything worked well from then on.
Now to figure out licensing....