Permit Usage of Self-Signed Certificates for SecureBoot VMs

[chrisfair]

Is your feature request related to a problem? Please describe.
I would like to be able to define a VM to use uefi, then in the uefi "firmware" I would like to be able to configure my own self-signed cert for secureboot. Currently I can define the VM no problem via virsh XML file but when I add my certificate it comes back "Validation Error". In Proxmox and other Qemu hypervisors this is not a problem and we are able to define secure boot with a selfsigned key.

Describe the solution you'd like
I would like the ability to utilize a self-signed key for secure boot. I am not interested in using a certificate signed by Microsoft as we use a key we maintain via HSM and that is plenty secure for us (we presign our kernel, initramfs, and bootloader with our private key and as a result the self signed certificate is plenty secure for us.

Describe alternatives you've considered
I would like the ability to use a self-signed certificate within the UEFI machine (I was using the debian spin) for my VM. I am able to use self-signed certificates in Proxmox.
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Additional context

Non-Working Message in Seapath

Working Message in Proxmox