How do I use HTML code in Flutter notifications?

Question

I started Flutter exactly today.
I want to use HTML code within Android notifications.
It seems that by setting the DefaultStyleInformation argument to true, HTML can be used, but I don't know how to write the actual code.

//This is the interface provided.

/// The default Android notification style.
class DefaultStyleInformation implements StyleInformation {
  /// Constructs an instance of [DefaultStyleInformation].
  const DefaultStyleInformation(
    this.htmlFormatContent,
    this.htmlFormatTitle,
  );

  /// Specifies if formatting should be applied to the content through HTML
  /// markup.
  final bool htmlFormatContent;

  /// Specifies if formatting should be applied to the title through HTML
  /// markup.
  final bool htmlFormatTitle;
}

The following is the code I am writing. I feel I need help with the "//here" part.

import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'dart:io'; 

 Future<void> showBigTextNotification() async {
    const styleInformation=DefaultStyleInformation(true,true);
    const NotificationDetails notificationDetails = 
    NotificationDetails(
      android: AndroidNotificationDetails(
       'channel_id',
       'Channel Name',
       importance: Importance.max,
       priority: Priority.high,
       styleInformation: styleInformation
       ),
       iOS: IOSNotificationDetails());

    await flutterLocalNotificationsPlugin.show(
      id, 
      Platform.isAndroid? '<b>'${title}'</b>': title,     // here???
      Platform.isAndroid? '<b>'${content}'</b>': content, // here???
      payload: 'Destination Screen(Big Text Notification)');
  }

thanks.