How to add EFI variable storage to a LoongArch64 VM?

[asdfugil]

Host information:
OS: macOS 14.4.1
UTM: UTM 4.5.2
Chip: Apple M1 Pro

I cannot figure out how to add EFI variable storage to a LoongArch64 VM, so I cannot properly install grub in the VM.
It does boot fine if I hack it and copy /boot/efi/EFI/debian/grubloongarch64.efi to /boot/efi/EFI/BOOT/BOOTLOONGARCH64.EFI

config plist: config.plist.zip
UEFI firmware: QEMU_EFI_7.2.fd.zip