Hmmm... "If there is only one charge point at the site then it is usually not necessary to map man_made=charge_point separately. Just tag the socket information to amenity=charging_station.

This feature is optional. It is usually not necessary to map each charge point at charging station sites. Note that only amenity=charging_station will be rendered on maps and will show up in search results."
https://wiki.openstreetmap.org/wiki/Tag:man%20made=charge%20point