Add annotation

diff --git a/pkgs/messages/example_json/bin/example.dart b/pkgs/messages/example_json/bin/example.dart
index 1b6b131..6143153 100644
--- a/pkgs/messages/example_json/bin/example.dart
+++ b/pkgs/messages/example_json/bin/example.dart

@@ -23,6 +23,7 @@
   await messages.loadLocale('fr');
   print('AboutMessage fr:');
   print('\t${messages.aboutMessage('typesafe.fr')}');
+  print('\t${messages.helloAndWelcome('henry', 5)}');
 
   ///To enable this, add `generateFindById: true` to the pubspec section
   // print('\t${messages.getById('aboutMessage', ['get-by-id.fr'])}');

diff --git a/pkgs/messages/lib/src/message_format.dart b/pkgs/messages/lib/src/message_format.dart
index 909d7a4..a92949e 100644
--- a/pkgs/messages/lib/src/message_format.dart
+++ b/pkgs/messages/lib/src/message_format.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import 'package:meta/meta.dart';
+
 // ignore_for_file: non_constant_identifier_names
 import 'plural_selector.dart';
 
@@ -32,9 +34,19 @@
   Preamble get preamble;
   PluralSelector get pluralSelector;
 
-  String generateStringAtIndex(int index, List args);
+  String _generateStringAtIndex(int index, List args);
 
-  String generateStringAtId(String id, List args);
+  String _generateStringAtId(String id, List args);
+}
+
+extension MessageListStatic on MessageList {
+  @ResourceIdentifier()
+  String generateStringAtIndex(int index, List args) =>
+      _generateStringAtIndex(index, args);
+
+  @ResourceIdentifier()
+  String generateStringAtId(String id, List args) =>
+      _generateStringAtId(id, args);
 }
 
 sealed class PluralMarker {

diff --git a/pkgs/messages/pubspec.yaml b/pkgs/messages/pubspec.yaml
index 75eb2b4..dc0aaba 100644
--- a/pkgs/messages/pubspec.yaml
+++ b/pkgs/messages/pubspec.yaml

@@ -10,6 +10,7 @@
   collection: ^1.17.1
   intl: ^0.18.0
   logging: ^1.2.0
+  meta: ^1.15.0
   native_assets_cli: ^0.6.0
   path: ^1.9.0