Very often, sensors for temperature and humidity and so on are not very exact and people have a exact reference. It would be nice if we could calibrate a sensor in an easy way without creating a second template sensor.
homeassistant: customize: sensor.aqara123: calibrate: -2
or like in ESPhome:
calibrate_linear: - 0.0 -> 0.0 - 40.0 -> 45.0 - 100.0 -> 102.5
Edit: there is already another feature request for the same thing: Calibrate Sensor