Map of the StartupBus EU locations and city stops

map.geojson

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "marker-size": "large",
        "marker-color": "#ff0000",
        "marker-symbol": "bus"
      },
      "geometry": {
        "type": "Point",
        "coordinates": [
          4.896254539489746,
          52.36369009503598
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [
          4.41375732421875,
          51.223227728996164
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [
          6.943359374999999,
          50.94458443495011
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [
          13.392333984375,
          52.522905940278065
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [
          14.425048828125,
          50.0923932109388
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [
          11.57958984375,
          48.1367666796927
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [
          16.380615234375,
          48.22467264956519
        ]
      }
    }
  ]
}

I wonder where the external resources are, or does the platform know a geojson gets rendered as a map?