qt-everywhere-src-5.15.1/qtlocation/examples/location/geojson_viewer/data/04-polygon.json

{
    "type" : "Polygon",
    "coordinates" : [
     [
       [17.13, 51.11],
       [30.54, 50.42],
       [26.70, 58.36],
       [17.13, 51.11]
     ]
    ],
    "bbox" : [50, -50, 10, -10]
}