fromJson static method
Implementation
@visibleForTesting
static MatchFacesRequest? fromJson(jsonObject) {
  if (jsonObject == null) return null;
  List<MatchFacesImage> images = [];
  for (var item in jsonObject["images"]) {
    images.add(MatchFacesImage.fromJson(item)!);
  }
  return MatchFacesRequest(images,
      outputImageParams:
          OutputImageParams.fromJson(jsonObject["outputImageParams"]),
      tag: jsonObject["tag"],
      metadata: jsonObject["metadata"]);
}