You can add any custom folder under This PC in File Explorer in Windows 11/10 by editing the Registry by following this tutorial. In Windows 11/10 File Explorer Navigation Pane, if you want, you can ...
You can share files and folders on OneDrive from within Office apps, from your desktop, or from the OneDrive website.
First, open the File Explorer using the Win+E hotkey and move to the target directory where you want to add comments to folders.