Have you looked at the REST API to see if that would work for you? You would need to know the Pull Request ID and the hashes you want the comments for https://developer.atlassian.com/static/rest/bitbucket-server/5.2.2/bitbucket-rest.html#idm45866556195824
Outside of possibly using the REST API, there is an open enhancement to add this functionality to Bitbucket Server. You can watch and vote on that issue here:
Hello! My name is Mark Askew and I am a Premier Support Engineer for products Bitbucket Server/Data Center, Fisheye & Crucible. Today, I want to bring the discussion that Jennifer, Matt, and ...
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