在Flutter中，是否可以将我的MaterialApp的themeData设置为使用大写作为所有文本值的默认值？

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        textTheme: TextTheme(
          headline1: TextStyle(
            fontSize: 24,
            fontWeight: FontWeight.bold,
            textCapitalization: TextCapitalization.characters,
          ),
          bodyText1: TextStyle(
            fontSize: 16,
            textCapitalization: TextCapitalization.characters,
          ),
        ),
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Theme Demo'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              'HELLO',
              style: Theme.of(context).textTheme.headline1,
            ),
            Text(
              'WORLD',
              style: Theme.of(context).textTheme.bodyText1,
            ),
          ],
        ),
      ),
    );
  }
}