如何将“飞镖:ui”图像渲染成Flutter？

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Dartboard UI',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: DartboardUI(),
    );
  }
}

class DartboardUI extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Dartboard UI'),
      ),
      body: Center(
        child: Container(
          width: 200,
          height: 200,
          decoration: BoxDecoration(
            color: Colors.green,
            shape: BoxShape.circle,
          ),
          child: Center(
            child: Text(
              '飞镖:ui',
              style: TextStyle(
                fontSize: 24,
                color: Colors.white,
              ),
            ),
          ),
        ),
      ),
    );
  }
}