Reference any device state/value in notification app?

Each morning at 9:00 am I want to receive a notification with the current pool temperature from a sensor in the pool.

Can I reference a device and value in the notification app or how would I go about solving the above?

Eg. Pool temp is %poolsensor%.%temp%

Like this, with a simple RM rule:

The variable 'pool temp' is set from your pool temp sensor, in this case mine is called 'a omni sensor'.

The Every Day at 9:00 AM comes from Periodic Schedule, Daily, every 1 day.