How to use any app using shortcut

You need to understand what Shortcuts is, and is not, and how it works.

Primarily, Shortcuts relies on developers exposing parts of their application data to the Shortcuts interface.

Shortcuts cannot arbitrarily open any app and extract specific information unless the developer has made that information available.

Without developer support, Shortcuts is pretty much limited to opening an app, but it has no idea of how to interact with that app unless the developer implements hooks within the app to make it accessible.

In this case it sounds like you want Shortcuts to open the Airtel app and extract the 'data remaining' value. This requires that AirTel have made this data available to Shortcuts. Without being an AirTel customer and having their app installed, there's no way anyone here can tell if that's the case.

In your case, when you use Shortcuts and choose to add an Action, Shortcuts will show you apps where developers have added Shortcuts-level access (this is why applications such as Mail, FaceTime, Safari, etc. are listed here, because these developers have added Shortcuts support). If the AirTel app isn't listed, then they haven't added any Shortcuts-level access and you're out of luck.

Deepak ~ Before considering a shortcut, check to see if the Airtel app provides a widget that does what you want:

How to add and edit widgets on your iPhone

...But if not, in Shortcuts, check to see if the Airtel app provides a shortcut action that does what you want:

Navigate the action list in Shortcuts on iPhone or iPad

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You might want to review the documentation:

Shortcuts User Guide - Apple Support

See this on how to set up a shortcut

1. In the Shortcuts app  on your iPhone or iPad, tap  in the upper-right corner of the screen.
2. An empty, untitled shortcut appears in the shortcut editor.
3. Tap New Shortcut, tap Rename, type the name of your shortcut, then tap Done.
4. Tap Add Action.
5. A list of action categories appears.
6. Tap a category (such as Media or Web), then tap an action in the list to add it to your shortcut.
7. Note: You may have to scroll to see all the available actions in a category.
8. You can also touch and hold an action in the list, then drag it to the position you want in the shortcut editor.
9. To add another action, swipe up on the search field at the bottom of the screen, then choose an action.
10. Tip: When you add another action, the action category you previously chose from opens. To return to the list of all action categories, tap Done.
11. When you’re finished adding actions to your workflow, tap Done.
12. The shortcut is added to your shortcuts collection, in both the All Shortcuts and My Shortcuts categories.
13. For information on customising the appearance of your new shortcut (the rectangle in your shortcuts collection), see Modify shortcut colours and icons on iPhone or iPad.
14. To test your new shortcut, tap  on the shortcut to open it in the shortcut editor, then tap .
15. To stop the shortcut, tap .