Can I change the entity used by a trend helper?

I have a helper, “Lounge Temp Falling” to tell me when it is getting colder based on a single temperature monitor.

I have added 2 more sensors to the room and have created another helper to average these 3 sensors.

I’d like to adjust my “Lounge Temp Falling” helper to now read the average helper I have created

I cannot see how to do this in the UI. Is it possible?


Trend Options under the helper details appears to allow me to change anything but the source entity