Modifying firmware is an advanced task. Errors can result in the virtual machine failing to boot or triggering "Unrecoverable Error" messages.
A popular utility used to modify Phoenix-based BIOS and EFI images. VMware EFI Mod Kit [Updated 09-2021].7z
Modifying internal strings like the "Manufacturer" or "Product Model" within the EFI.rom file. Modifying firmware is an advanced task
Once the ROM is modified, you must manually point your VM to it by adding efi64.filename = "modified_efi.rom" to the .vmx configuration file. VMware EFI Mod Kit [Updated 09-2021].7z
Update: Adding a driver to a UEFI firmware · Issue #40 - GitHub
While specific versions vary, a ".7z" kit from late 2021 usually includes: