This gist is almost entirely not unlike Derek Seaman's awesome blog:
Proxmox VE 8: Windows 11 vGPU (VT-d) Passthrough with Intel Alder Lake
As such please refer to that for pictures, here i will capture the command lines I used as i sequence the commands a little differently so it makes more logic to me.
This gists assumes you are not running ZFS and are not passing any other PCIE devices (as both of these can require addtional steps - see Derek's blog for more info)
This gist assumes you are not running proxmox in UEFI Secure boot - if you are please refer entirely to dereks blog.