Equivalent command for "Create authorization rule" in Azurepowershell

Hello, am trying to get an equivalent cmlet for "Create authorization rule" in azure powershell to add an SAS policy (Send or listen) to existing eventhub. if it is a new eventhub I know we can use "$NamespaceManager.CreateEventHub" which will create eventhub with the policy we need,  but for creating a second SAS policy for same eventhub I need a cmd equivalent to Rest-API "Create authorization rule".

Any help is really appreciated.