Not easy on the iPad unless you jailbreak and run iFile.
Apple has something called iFiles that you must pay for and I don't know it it is available for your iPad, certainly not for my ancient one.
But this is much better than iTunes, get:
Connect the pad to your PC and open iFunBox.
It might ask for permission if the ipad has not been shared on your PC before, where you will need itunes only once. For safety reasons go offline, both iPad and PC.
Open iFunBox and after it connects look on the left for "App File Sharing" and click it.
Orange folders appear on the right and if the name of the app you are using appears there you should be able enter the file structure and find what you want to rename/delete/copy to or from PC, etc. Anything goes, txt, pdf, epub, mp4 and of course the propriety extension of the app. It just has to be useable for the app of course.
If not, Jailbreak!
The only sensible thing to do with an old iPad.
...and keep the iPad offline, especially if not jailbroken
I have been hearing Apple is starting to delete apps from iPads that are older than 6 years.
Happened to me too (2013 iPad 4th gen), with a couple apps that Apple wanted to sign and then decided: oh, oh, ...bye.
All my apps that I got ...ahem, elsewhere, stay and run fine.
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