I'm not sure if this is possible from atlassian's end, based on the lack of add-ons responsible for such integration, but there's this request raised on leankit asking for such functionality:
I hope that helps. Rodrigo
This is Florent from LeanKit. I wanted to let you know that we recently released a very powerful Integrations hub to enable enterprise-grade integrations between LeanKit and JIRA (as well as a score of other great Enterprise applications), including new features such as two-way sync, advanced mapping. We are still supporting the point to point integrations Rodrigo and Wes pointed to, but are recommending the Integrations hub for teams and companies using LeanKit and JIRA at scale.
See more detail on our Integrations site:
Feel free to point any additional questions my way!
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