I export the grades as a .CSV file, and then import it into Aeries. I have to run several custom made Python scripts in between to add in the student Permanant IDs into the spreadsheet using their email addresses as the reference key. In short, it's possible, but complex and you'll need to be willing to spend the time coding it.
We've had this capability since the beginning of the 17-18 school year. IT had to enable it. It is a good process but updating late submission grades should be easier. There are too many clicks just to get to the point of updating. Aeries needs to code a script that enables one touch updates, something I would use after I have already linked an assignment, but then need to update a week later because more assignments have come in.