Hi, 
That’s not possible with this plugin.
The closest plugin I could find is Discourse Post Voting (thanks, Jammy, for correcting my silliness 
). Users can upvote posts once per topic (except the first post), so the rating would be the number of upvotes.
To export a list of users with ratings, you can use this plugin: Discourse Data Explorer. You can create an SQL query, and you will be able to download the list in CSV format. Check data & reporting sql-query if you need help.
Also, there is marketplace if you can afford to sponsor someone to make the exact plugin you’re looking for. 