This is called reverse geocoding. The ‘Function library for geolocation’ module seems to be able to do this. I've not tested the module myself but you could give it a try: https://appstore.home.mendix.com/link/app/29470/.
If the module does not suffice, take a look at the Google Geocoding API, specifically the part about reverse geocoding: https://developers.google.com/maps/documentation/geocoding/intro#ReverseGeocoding
Hope this helps!