如何将flutter rawkeyboardlistener设置为读取{} (花括号)而不是方括号？

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: RawKeyboardListener(
            focusNode: FocusNode(),
            onKey: (RawKeyEvent event) {
              if (event is RawKeyDownEvent) {
                if (event.logicalKey == LogicalKeyboardKey.openBrace) {
                  // 处理按下花括号的逻辑
                  print('按下花括号');
                }
              }
            },
            child: Container(
              width: 200,
              height: 200,
              color: Colors.grey,
              child: Text('按下{}'),
            ),
          ),
        ),
      ),
    );
  }
}