I have a short text question where the user can select a location on a Google map. I already set my API KEY and it seems to work just fine. However, the question is related to very specific insfrastructure in the city, so I wanted to incluide a layer of this infrastructure in order to help the users locate it. Is this possible? I know I have to host my geojson somwhere but I can't find a way to access the map properties from the source code panel.