Html content in notification message

Ionic Framework ionic-v3
1

Hi, I am able to get fcm notification messages in my app. but My message consists of HTML text like below example:

<h1><b>This is test Notification.</b><br> Regarding Html content in FCm Message</h1>

SO I need to get a result like

This is test Notification.
Regarding Html content in FCm Message

So please help me.