Flutter & Dart :如何从Json列表中取出5个url字符串到数组中

[
  {
    "url": "https://example.com/image1.jpg"
  },
  {
    "url": "https://example.com/image2.jpg"
  },
  {
    "url": "https://example.com/image3.jpg"
  },
  {
    "url": "https://example.com/image4.jpg"
  },
  {
    "url": "https://example.com/image5.jpg"
  },
  {
    "url": "https://example.com/image6.jpg"
  }
]

import 'package:json_annotation/json_annotation.dart';

part 'image_model.g.dart';

@JsonSerializable()
class ImageModel {
  final String url;

  ImageModel(this.url);

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

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

flutter packages pub run build_runner build

import 'dart:convert';

List<dynamic> jsonList = jsonDecode(jsonData);

List<String> urlList = [];

for (var json in jsonList) {
  ImageModel imageModel = ImageModel.fromJson(json);
  urlList.add(imageModel.url);

  if (urlList.length == 5) {
    break;
  }
}