It's certainly possible to do some "integration", but I'm not aware of any add-ons that will help you with Clarity directly - you'll need to define what you want from such and "integration" and then work out how to get Clarity and JIRA to talk to each other.
JIRA has a REST interface you can use to talk to it, as well as web-hooks in the workflows what allow it to poke information into Clarity.
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