Exporting Report to CSV

Is there a way to export a report output to Excel / CSV?

Not currently, you could export the network request itself, its a bit of a hack but it would work.
Go to the Network console (F12 → Network tab), find the report request and inspect the body, copy/export it.

You can create a custom database view, create a module with those fields (columns) and export via record list if you have the technical know-how.