For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Virtualization:Staging/openSUSE_Tumbleweed/Virtualization:Staging.repo
zypper refresh
zypper install libvirt-daemon-qemu
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Virtualization:Staging/15.5/Virtualization:Staging.repo
zypper refresh
zypper install libvirt-daemon-qemu
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Virtualization:Staging/15.4/Virtualization:Staging.repo
zypper refresh
zypper install libvirt-daemon-qemu