ERROR Did not find any UEFI binary path for arch 'x86_64'

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Hi, on Debian 11 are packages for this.
ovmf - UEFI firmware for 64-bit x86 virtual machines
ovmf-ia32 - UEFI firmware for 32-bit x86 virtual machines
qemu-efi-aarch64 - UEFI firmware for 64-bit ARM virtual machines
qemu-efi-arm - UEFI firmware for 32-bit ARM virtual machines

as long as virt-install says:

   --boot uefi
          Configure the VM to boot from UEFI. In order for virt-install to know the correct UEFI parameters, libvirt needs to be advertising known UEFI binaries via  domcapabilities
          XML, so this will likely only work if using properly configured distro packages.

I would say using switch “–boot uefi” is reasonable. If you can - update your packages…