Opening Apps in Split Screen through Shortcut

I know there are options in iOS 13 to perform an action when an app opens. What I would like to do is when I open a certain app then a second app opens in split screen. I can’t find a way.

I don’t think this is possible just yet—but it would be neat!

I wonder whether the newly built-in “saved” split view screens (sorry, don’t have the right terminology in front of me) might help? For example if you set up two apps side-by-side you should then be able to open again?

The logistics might depend a bit on which apps you want, though. I haven’t gotten the knack of it yet, myself.