Guidance here: Experimental Modded VMware-NVME Option ROM for AMIBIOS8 Core ( Legacy ) - Special Topics / NVMe Support for old Systems - Win-Raid Forum (level1techs.com)
[Experimental] NVMe Option ROM - BIOS/UEFI Modding / BIOS modules (PCI ROM, EFI and others) - Win-Raid Forum (level1techs.com) Good luck.