List array of array in class model flutter - flutter

Question

How to create class model in flutter if List Array of Array have 2 type data
Example
"value" : [["Water Melon", "Apple", 10, 23]]
#JsonSerializable()
class GetReportBodyData {
String type;
String title;
List<String> headers;
List<List<int>> value = new List<List<int>>();
GetReportBodyData({this.type, this.title, this.headers, this.value});
#override
String toString() {
return 'GetReportBodyData{type: $type, title: $title, header: $headers, value: $value}';
}
factory GetReportBodyData.fromJson(Map<String, dynamic> json) {
return GetReportBodyData(
type: json["type"],
title: json["title"],
headers: json["header"] != null ? List<String>.from(json["header"]) :[],
value: List<List<int>>.from(json["value"])
);
}
Map<String, dynamic>toJson() => {
"type": type,
"title": title,
"header": headers,
"value": value
};
}

Answer 1

class example {
List<List> value;
example({this.value});
example.fromJson(Map<String, dynamic> json) {
if (json['value'] != null) {
value = new List<List>();
json['value'].forEach((v) { value.add(new List.fromJson(v)); });
}
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
if (this.value != null) {
data['value'] = this.value.map((v) => v.toJson()).toList();
}
return data;
}
}
class Value {
Value({});
Value.fromJson(Map<String, dynamic> json) {
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
return data;
}