Thank you so much for posting that! For other newbs like me, I uploaded that rom to my vm folder in /user/domains (is this the best spot?), enabled the igpu in the VM settings and linked to the rom, and then, upon logging into the Windows 10 VM, Device Manager showed the iGPU started properly. I'm not sure if it matters, but I also have the Intel-GPU-TOP plugin installed.
I'm also using a GTX 1650 with my docker containers (namely Plex -- yes, I should probably have those swapped, but it is what it is). I wanted to enable the iGPU in Windows so I could occasionally use it with DVDFab. We'll see how that goes.