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:
Beginning on April 4th, we will be implementing push limits. This means that your push cannot be completed if it is over 3.5 GB. If you do attempt to complete a push that is over 3.5 GB, it will fail...
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