Flutter：在 pubspec.yaml 中找不到assets资源

your_project/
|-- android/
|-- ios/
|-- lib/
|-- assets/
    |-- test0.json // **Can access**
|   |-- file1.png
|   |-- file2.json
|   |-- ...
|   |-- jsons/
|       |-- test.json // **Can't access**
|       |-- file3.json
|       |-- file4.json
|       |-- ...
|-- pubspec.yaml
|-- ...

flutter:
  uses-material-design: true
  assets:
    - assets/
    - assets/images/
    - assets/jsons/

Future<void> initSupportFiles() async {
  try {
    // Get the Application Support directory path
    Directory appSupportDir = await getApplicationSupportDirectory();
    String appSupportPath = appSupportDir.path;

    // Check if the JSON file already exists in the Application Support directory
    String jsonFilePath = '$appSupportPath/jsons/test.json';
    File jsonFile = File(jsonFilePath);

    if (await jsonFile.exists()) {
      return;
    }

    // Read the JSON file from assets directly
    ByteData data = await rootBundle.load('assets/jsons/test.json');
    final buffer = data.buffer;
    await jsonFile.writeAsBytes(buffer.asUint8List());

    print('JSON file copied to Application Support directory.');
  } catch (e) {
    print('Error copying JSON file: $e');
  }
}