This is not possible at the moment. We will be focusing more on Slack-to-JIRA integration later this year so then such feature might find it's way.
At this point however, we have an improvement already in our backlog which does exactly what you are looking for but it will work only when you use our "Slack" tab on JIRA issue page to sent the message.
This should be released much sooner.
Hey Atlassian community, I help lead engineering at Sentry, an open-source error-tracking and monitoring tool that integrates with Jira. We started using Jira Software Cloud internally last year, a...
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