Happy to say that I managed to transfer my Roon setup to Unraid. It way pretty painless to be honest.
All I had to do is use the Edit in the Music Folder under Storage, as per @alex_h 's advice.
Quick question about updating now. When a new update from Roon appears all we have to do is just click on the UI? Or we have to update the docker? Not sure how this works, so forgive my ignorance. 