Edit, I appologize but I spoke too quickly on this...
What you're looking to do isn't difficult but it's also not native to addon... But that doesn't need to stop you. What is a concern is the number of queries added (one per post).
Votes are stored in a table and along side the post but not with the user so to fetch them you need separately from the big query that fetches threads. If you're interested in this (realize it's one query per post) let me know and I can write up the code.
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