如何在flutter的firebase存储中保存重叠了"text“的"Image”？

import 'package:flutter/material.dart';
import 'package:firebase_storage/firebase_storage.dart' as firebase_storage;

void uploadImageWithText() async {
  // 获取Firebase存储引用
  firebase_storage.FirebaseStorage storage =
      firebase_storage.FirebaseStorage.instance;

  // 上传图片文件
  firebase_storage.Reference ref =
      storage.ref().child('images/image_with_text.jpg');
  await ref.putFile(imageFile);

  // 获取图片URL
  String imageUrl = await ref.getDownloadURL();

  // 在Flutter中显示重叠了"text"的"Image"
  runApp(MaterialApp(
    home: Scaffold(
      body: Center(
        child: Stack(
          children: [
            Image.network(imageUrl),
            Positioned(
              top: 20,
              left: 20,
              child: Text(
                'Text',
                style: TextStyle(
                  fontSize: 24,
                  color: Colors.white,
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
          ],
        ),
      ),
    ),
  ));
}