Include full commit messages in the new Bitbucket for Slack app

The old Bitbucket app for Slack, which was maintained by Slack, and which is going to be shut down in a couple of months now that Atlassian has released an official integration, includes full commit messages – not just the top line/subject. My team valued being able to write detailed messages, which would show up on Slack, and we'd really appreciate being able to retain this feature. I would think this would be trivial to do, at least as an option.