DrawParkingZones.cs

using var httpClient = new HttpClient();
stringResult = await httpClient.GetStringAsync(url);
jsonResult = JsonConvert.DeserializeObject<FeatureCollection>(stringResult);

foreach (var parkingZone in jsonResult.Features)
{
    if (parkingZone.Geometry is not Polygon polygon) continue;
    var points = polygon.Coordinates.First().Coordinates;

    var mapPolygon = new Microsoft.Maui.Controls.Maps.Polygon
    {
        StrokeWidth = 8,
        StrokeColor = Color.Parse("#1BA1E2"),
        FillColor = Color.Parse("#881BA1E2"),
        //ClassId = parkingZone.Properties.ElementAt(4).Value.ToString()
    };

    foreach (var p in points)
    {
        mapPolygon.Geopath.Add(new Location(p.Latitude, p.Longitude));
    }

    map.MapElements.Add(mapPolygon);
}