How to restore an app and data?

If you have deleted an App from your iPad, the corresponding data will also have been deleted. The App can be reinstalled from the Apple App Store - unless for some reason it has been withdrawn by the respective App Developer.

If you have a current iCloud or iTunes backup of your iPad, taken before the App was deleted (and not overwritten since), you may be able to recover data associated with the previously deleted App - but be mindful that you cannot selectively restore App data; it’s all or nothing. In restoring your iPad to an earlier time, newer data might also be lost

" but be mindful that you cannot selectively restore App data; it’s all or nothing"

That really sucks. I want to restore data on an App deleted a year ago.