As far as I know there is not currently a feature to do as you want. There primary philosophy of Duplicati is to trust no one so putting a plain text file at the destination (even if it’s just what’s currently in reports) wouldn’t be high on the feature list.
That being said, there are plenty of options that have been added that do assume there is some trust involved.
I believe some we has gone on at GitHub to add full JSON formatting for the report and then to be about to sent it “anywhere” (including a local file). I don’t believe any of that had made it into a release yet, though.
Your best bet would probably be to check out the work done there and see if you can add (or get others to add) what your looking for.
