Grouped station counts by a field (ArcGIS outStatistics group-by), e.g.
countBy("state") for stations per Bundesland. Sorted descending by count.
The layer's field metadata (names/types/aliases) — for building queries.
The matching stations as a GeoJSON FeatureCollection (f=geojson).
A page of charging stations (ArcGIS f=json).
The number of stations matching the query (
returnCountOnly).