For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cahu:branches:1246406/openSUSE_Factory/home:cahu:branches:1246406.repo
zypper refresh
zypper install selinux-policy
For 15.7 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cahu:branches:1246406/15.7/home:cahu:branches:1246406.repo
zypper refresh
zypper install selinux-policy
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cahu:branches:1246406/15.6/home:cahu:branches:1246406.repo
zypper refresh
zypper install selinux-policy