The MLS policy will not be covered bye the default SLAs (Basic/Standard/Premium) but require a special subscription. Therefor it needs to be pulled from the core RHEL repositories / ISOs and channels and provided via a separate mls channel (channel families: rhel-server-mls / rhel-client-mls ).
As it turns out, the selinux-policy-mls package is just a sub-package of selinux-policy. So no way to pull it out.
Product Management has reviewed and declined this request. You may appeal this decision by reopening this request.