Temperature sensor exposed to Alexa - unit of measurement

Hello,
i have some Aqara temperature and humidity sensor. The work nicely, i configured them for displaying temperature in °C.
I exposed them to Alexa and… magic… alexa shows temperature in °F
I can’t find a way to configure this. entity_config in the exposed entity section does not accept the unit_of_measurement tag, so where should i define this? it seems also in alexa app it is impossible to set the unit…
Thanks

Edit: ok, too fast, i had some climate entities displayed in °C (strangely, i’d say), but there is a config option in the alexa app to fix the unit of measurement. Sorry for wasting your time