There's an OSX version of Jira releases which is packaged for Macs. You can also use the zip or TAR archives to install manually. Even if it seems not to be documented well (I might be mistaken but I think Atlassian does not officially support OSX), it's working well on OSX!
The detailed steps for TAR install are here: https://confluence.atlassian.com/adminjiraserver/installing-jira-applications-on-linux-from-archive-file-938846844.html
I've been using that for years and it's always been working (OSX is based on Unix :) ).
Hope this helps!
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