I don’t think it gets sorted out. And maybe also not needed for Whonix KVM Host / whonix-host-kvm.
For Whonix KVM Host we could copy over the files during a build-step.
For sudo apt-get install whonix-host-kvm on Debian hosts it looks more complicated. We’d need a deb package shipping the qcow2 files. Not sure that would be crazy.