StaticMapRequest: how to add "style"?

I want to add the result of Google Styling Wizard (json) to a StaticMapRequest.
StaticMapRequest request = new StaticMapRequest(Markers, new ImageSize((int)ps.GetWidth(), (int)ps.GetHeight())) { MapType = MapType.Hybrid, ApiKey = "xxx", Style = ?????

Output from Styling Wizard (json):
[ { "elementType": "geometry", "stylers": [ { "color": "#f5f5f5" } ] }, { "elementType": "labels.icon", "stylers": [ { "visibility": "off" } ] },