Marco, I've no experience of buying libre sensors from other countries, so I can't guarantee this will work but here's a suggestion.
I get sensors in the UK, the official reader reads in mmol/L.
I wanted to get alarms etc. on my phone, so I then bought a transmitter called a blucon nightrider from
https://www.ambrosiasys.com/order , $85 non-waterproof, $135 waterproof, and some shipping charges.
The blucon sits on top of my sensor and transmits a reading to my android phone every 5 mins. It doesn't need to be an nfc phone for this, just bluetooth.
The app on my phone is xDrip+
https://jamorham.github.io
Now, the reason I mention all this is that in the settings in xDrip+, I can choose whether to display as mmol/L or mg/dl - see pic below. I've tried both and it works perfectly well with either. So, that's a UK sensor giving me mg/dl through the app if I want it to. Plus I get alerts and full cgm.
It's also got a range of about 15 languages you can switch between.
There's a newer transmitter called miaomiao, I assume you'll get the same result if you're running it to xDrip+ on android, but it's a bit more expensive. You'd need a different app if you're on iphone, Spike, but I don't know whether that's got the option of switching measurements, I assume it does.
View attachment 28671