Administrative Units (Preview) - Device Management?

Use Case: Global Company with separate business units around the world operate autonomous helpdesk organizations. They want to segment IT Administrative authority over Azure AD Devices.

Currently Administrative Units appears to not include Devices. Is this planned, or is there another way to limit the devices that an Azure Administrator has authority to manage?

https://docs.microsoft.com/en-us/azure/active-directory/users-groups-roles/directory-administrative-units