如何在Flutter中序列化抽象类？

dependencies:
  json_annotation: ^4.0.0
  json_serializable: ^4.1.0

import 'package:json_annotation/json_annotation.dart';

part 'abstract_class.g.dart';

@JsonSerializable()
abstract class AbstractClass {
  String name;

  AbstractClass(this.name);

  factory AbstractClass.fromJson(Map<String, dynamic> json) =>
      _$AbstractClassFromJson(json);

  Map<String, dynamic> toJson() => _$AbstractClassToJson(this);
}

flutter pub run build_runner build

import 'abstract_class.dart';

void main() {
  final abstractClass = AbstractClass('John');
  
  // 序列化
  final json = abstractClass.toJson();
  
  // 反序列化
  final newAbstractClass = AbstractClass.fromJson(json);
}