You can expand Jira issues in private messages and DMs using the expand Jira issue action.
What to know:
You can use the Expand Jira Issues action anywhere within Slack.
The bot does not need to be invited to the channel to use this feature
Expanding Issues
Click on a message in Slack.
Choose the action Expand Jira Issues.
View the threaded reply to view the issue information.
If you don't see the Expand Jira Issue action go to More message actions to find it.