Dart: parse api response and dynamically create child T from parent - flutter

Question

Looking for a clean way to parse out data from an API.
The API returns data for creating “Boat” and “Car” models wrapped up in metadata.
{
“timestamp” “0000”,
“data”: {
“count” “1”,
“results” [
{
“name”: “boatyMcBoatFace”
}
]
}
}
I want to create 2 classes for the metadata and also the boat/car data using custom fromJson() methods.
Current implementation is something like this
Class Boat {
String name;
Boat.fromJson(json) {
this.name = json[‘name’]
}
static List<Boat> listFromJson(List<dynamic> json) {
return json.map((c) => Boat.fromJson(c)).toList();
}
}
ResponseModel<T> {
String timestamp
DataModel data
ResponseModel.fromJson(json) {
this.timestamp = json[‘timestamp’]
this.data = DataModel<T>.fromJson(json[‘data’])
}
}
DataModel<T> {
String count
List<T> results
DataModel.fromJson(json) {
this.count = json[‘count’]
this.results = json[‘results’] // change this, see below
}
}
Currently I'm creating a ResponseModel, which in turn creates a DataModel.
But then I'm manually creating and setting Boats using:
// yes
final res = methodThatMakesHttpRequest();
final apiResponse = ResponseModel<Boat>.fromJson(res);
// no
final boats = Boat.listFromJson(apiResponse.data.results);
apiResponse.data.results = boats;
Ideally I would remove those last two lines, and instead have Boats get created dynamically within DataModel.fromJson with something like
DataModel.fromJson(json) {
this.count = json[‘count’]
T.listFromJson(json[‘results’])
}
But this of course does not work as T.listFromJson does not exist.