WHave a look at the video that Chris Titus did a while back on GPU Passthrough on Bazzite. https://www.youtube.com/watch?v=B1VTBWH6mXA Hopefully that helps.
YouTubeTitus Tech Talk
Passthrough, VM Creation, and Hard Drive Move.
00:00:00 - Bazzite Passthrough Intro
00:05:27 - Bazzite is DIFFERENT
00:11:54 - Looking Glass
00:54:10 - Adding NFS Shares
01:00:57 - VM in Virt-Manager
01:03:33 - Stream #2 VM Creation
01:13:09 - Looking Glass Modifications
01:25:37 - SUCCESS
01:27:46 - Cyberpunk on GTX 1660
01:36:46 - Moving Bazzi...
00:00:00 - Bazzite Passthrough Intro
00:05:27 - Bazzite is DIFFERENT
00:11:54 - Looking Glass
00:54:10 - Adding NFS Shares
01:00:57 - VM in Virt-Manager
01:03:33 - Stream #2 VM Creation
01:13:09 - Looking Glass Modifications
01:25:37 - SUCCESS
01:27:46 - Cyberpunk on GTX 1660
01:36:46 - Moving Bazzi...
WIf you get stuck in one of the sections or have questions, HikariKnight is the GPU Passthrough guru here
Rwell i found a guide for silverblue that should be mostly the same but i cant get the nvidia onto vfiopci it still is on nvidia driver
WYou would probably need to blacklist Bazzite from using the Nvidia driver if you trying to pass it through to the VM
HA lot of laptops just can't GPU passthrough and you need to find out the hard way