Add a specific folder to OneDrive, outside of "My Documents" [duplicate]

Question

I know the following dialog box in the OneDrive settings.

But how can I add an arbitrary folder to OneDrive sync, which is outside of "My Documents", "My Music", "My Pictures", and more generally outside of C:\Users\MyUser\...?

Example: Let's say I want to add the folder D:\MyData\ABC\SharedFolder to OneDrive syncing and nothing else, how do I do that?

NB:

• related but very unclear answers: How Do I Make OneDrive Sync Only Specific Folders?

• not duplicate, slightly different: Can you force a single folder/file to sync with OneDrive?