Renaming bookmarks

I bought a Samsung Galaxy Tab A 10.1 (2016) tablet yesterday (20170828) and installed the latest version of Adobe Acrobat Reader via https://play.google.com/store/apps/details?id=com.adobe.reader&hl=en

Adobe Acrobat Reader - Android Apps on Google Play

I would like to use the bookmark feature, but it would be more useful to me if I could rename bookmarks, and if it is at all possible, I don't seem to be able to find how this can be done. I am currently using comments instead. That works well, but is a lot less compact than bookmarks would be. So my question is: is it possible to change the names of bookmarks, or is it possible to create bookmarks with a custom name, from within the reader? I could also, of course, use Acrobat on my computer to do it, but that would be less handy or impossible in mobile situations.

Thank you for any insights!

Bart.