External temperature sensor for climate Entity

Hi I have added recently an HVAC system into HA. everything is working fine, besides two things the current temperature is not reported, making the Lovelace card a bit sad without the temperature, and the precision is not correct (1.0 instead of 0,5).

Would be tine to have the option to set up like a group an external temperature sensor as the main unit one, as well as override the precision.

I have a sensor group in order to have the middle temperature inside home and will be perfect to use it as the displayed/linked temperature for the climate Entity.