We do not have domain joined workstations for our customers workstations. So we would like to know if MS Intune like custom policy based on OMA-URI can be added as a feature. This will allow us to control GPO on non-domain joined workstations.

Similar feature like MS Intune is available on a RMM product Miradore https://www.miradore.com/knowledge/windows/custom-policy-configurations-for-windows-10-and-11/