Change default root of modular page children

Hello there!
We’ve got modular pages. No matter from where i decide to add a modular, the root is always the / folder of the pages structure. Is it possible to change the default root of a Modular, when i create the Modular from a side edit page?

So if I am in the editing mode of the /modularPage and click on “Add Modular”, the root (parent) should be the side im editing right now.