My goal is to add an entry to Windows 10's Navigation Pane that holds user-defined items. The idea is to create a new category outside of the existing ones so that items can be added under it without creating too many entries under Quick Access. Simply using "Pin to Quick Access" is unsatisfactory and all the searching I've done about this topic yields results that only relate to right clicking and pinning/unpinning folders.
I see that applications like OneDrive and Visual Studio are able to create their own dedicated entries. The highlighted category for Visual Studio in the screenshot is the closest representation to what I want to make. (Interestingly, the Visual Studio one only appears in file browser dialogs launched from Visual Studio. I would like my category to appear everywhere in the shell where the pane is present.)
What registry keys enable them to do this and is it possible for me to add a custom entry?