Not possible. The best you can do is open settings at the right page.
I wanted to create a shortcut to run a backup (as I very rarely have my phone on while it's charging) but it's the same problem. My shortcut can open the settings app at the backups page, but not actually run the backip itself, hence can't be automated.
Yes thank you... I did in fact finally figure out ways to make a few shortcuts that I use a LOT. Boy Apple is NOT nailing the shortcuts thing... but yes you can make a shortcut to get you where I wanted to go as others have said.