[Observium] Low Sensor dBm alerts

Hi

Im trying to create some alerts in Observium 18.10.9472 to alert when a fiber interface goes into a warning or alert state for the receive or transmit power dBm.  I am only interested in ports that are in a no-shut config.  I have made a port group which contains all ports in a no shutdown state but cant see a way to map this to the associations:

How can I do this as there is no way to map that group to the alert??  The issue is that I need to exclude any ports in no-shut as these ports are reporting an alarm as there is no power being received on these ports.

Thanks

Richard