Choose Unit to display °C or °F without convert

Feature Requests
1

Hi In Canada, we use °C for all temperature except pool, keep using °F.
If I ask Google Assistant or HomeKit about pool temperature, I want the temperature in °F instead °C. But, if I ask for outside temperature, there will return the temperature in °C.

By adding something like “unit_to_display” will be nice.
ex:

sensor:
  - platform: mqtt
    name: "Pool_Temperature"
    state_topic: "DS1820/28B927A412190184/Value_C"
    unit_of_measurement: '°C'
    unit_to_display: '°F'
2

This definitely gets an up vote from me.

:+1: