Controll the Tempo with a midi Controller

it is not possible to assign the midi controller to the tempo channel.
It is possible to change the tempo by mousclick.
Why is it not possible to assign the tempo changes to a midi controller.
There is no option for the Tempochange in the Funktion Browser of the midi assign assistent.
It is just possible to choose “type in Tempo” or enable/disable the tempo channel.
Also the midi lern option doesn’t recognize the tempo changes?
Is there a way to include midi tempo changes?

I am looking forward to an apply.