如何在flutter中限制JSON数组输出？

dependencies:
  flutter:
    sdk: flutter
  json_annotation: ^4.0.0
  json_serializable: ^4.1.0

import 'package:json_annotation/json_annotation.dart';

part 'user_model.g.dart';

@JsonSerializable()
class User {
  final String name;
  final int age;

  User({required this.name, required this.age});

  factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);
  Map<String, dynamic> toJson() => _$UserToJson(this);
}

flutter pub run build_runner build

import 'dart:convert';

List<User> parseUsers(String jsonString) {
  final parsed = jsonDecode(jsonString).cast<Map<String, dynamic>>();
  return parsed.map<User>((json) => User.fromJson(json)).toList();
}

List<User> users = parseUsers(jsonString);
List<User> limitedUsers = users.sublist(0, 5);