Mailing the story:
Manjaro Testing Instance setup as KVM Guest in UEFI mode (Fedora 40 KVM Hypervisor)
Original Virt-manager UEFI option setup should be configured as follows /usr/share/edk2/ovmf/OVMF_CODE_4M.qcow2 . Next step is supposed to be creating /boot/efi fat32 EFI partition during Calamares Installer virtual disk layout configuration.