Okay right now limited number of shortcodes are supported in app ,mainly for videos in app and this is only available for units .
If you want this in blog posts in app or in any other pages then we would need add custom apis for fetching post content and then also need to add custom pages in app manually which will show the html .
better and quick way would be adding a page in app's menu and opening it in in app browser : which will open that link inside app in inbuilt browser .
refer : https://ionicframework.com/docs/native/in-app-browser/
this is how we will do it .