You will have to move all your contents to the OneDrive folder in your drive and create a symbolic link to the actual folder inside your OneDrive folder.
Open your command prompt as admin and use this command to move the files first.
move “C:\OriginalFolderPath” “C:\OnedriveFolderPath”
Once moved, use this command to create the symbolic link.
mklink /d “C:\OriginalFolderPath” “C:\OnedriveFolderPath\YourFolder”
This is a hassle anyway. I wish Microsoft could come up with a feature for OneDrive.