Thanks for your answer, @Wayne-TP.

Very easy: I'd like to compare 2 temperature sensors T310 values to get an alert. 

In practice, the goal is to have a notification 'Open the window' when the oustide temperature is lower than the inside temperature.

Pseudo code:

If sensor1.temperature < sensor2.temperature then

       SendAlert()

end

At the moment, I have found a workaround, I created many automations, but it's boring:
 

If sensor1.temperature < 22 and sensor2.temperature > 22 then

       SendAlert()

end
 

If sensor1.temperature < 23 and sensor2.temperature > 23 then

       SendAlert()

end

If sensor1.temperature < 24 and sensor2.temperature > 24 then

       SendAlert()

end

PS: the Tapo products are incredible!  Thanks a lot.