如何在flutter上让我的文本在custom_radio_grouped_button包中变得笔直？

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Custom Radio Grouped Button Example'),
        ),
        body: Center(
          child: CustomRadioGroupedButton(
            options: [
              OptionModel(
                value: 'option1',
                label: 'Option 1',
                textStyle: TextStyle(fontSize: 16, fontWeight: FontWeight.normal), // 自定义样式
              ),
              OptionModel(
                value: 'option2',
                label: 'Option 2',
                textStyle: TextStyle(fontSize: 16, fontWeight: FontWeight.normal), // 自定义样式
              ),
            ],
            onSelectedChanged: (value) {
              print('Selected: $value');
            },
          ),
        ),
      ),
    );
  }
}