Thank you so much for answering and for your time.
I had already tried that before posting here, but no cloud accounts appear there, only the text editor.
It turns out that doing that is the same as adding a shortcut from the app widgets or using "Add to... / home screen" from within the app.
The issue, I just found out, is with WebDav, because all of the above work with Dropbox, but non of them work with WebDav.
Is there anyway to add a home screen shortcut to a WebDav cloud client?
I'm assuming that if that account be added as a file location and can be seen in the app listing it should be able to provide a shortcut.
I can get shortcut for Google Drive too.