Currently you may try to import the charging stations as a gpx overlay into Kurviger.
Kurviger uses OpenStreetMap (OSM) as its map source.
As far as I can see there are still very few charging stations entered into OSM.
goingelectric.de seems to maintain their own database although they use OSM as a map source. That’s a pitty, because IMHO the information would be more useful in a open map than in a proprietary database.