You could edit that json file, but it will still move the items and add new ones as you start moving files to other places. But you can always drag the files into the any of the favorites as you would into any of the recent destinations, so basically, the Recent Destinations is just one favorite group that is shown on the right sidebar. So if you have a list of folders that you use as frequent destinations, you can simply create a new favorite group with and arrange folders in it the way you like.