It look like that is generated from an add-on for Confluence called the Open API Documentation for Confluence. I checked and they do not have an add-on for JIRA.
I see that Bitbucket exposes it in the API, however, looking at the JIRA API I do not see a path that provides swagger.json output.
You can create a Suggestion to have this added to JIRA at JAC. If you do so please post the link to the ticket here so the community can vote on it and add impact.
The Open API Documentation for Confluence add-on takes a swagger.json file like the one I'm after and produces confluence documentation, much like RADAR does. For Atlassian to have produced their documentation using RADAR then they must have had a copy of that json file. I don't necessarily want it to be exposed as bitbuckets is, though that would certainly be lovely. Instead I'm aftet a one off copy of that json, wherever it may be. Pastebin, dropbox, I'm not fussy, but it definitely exists somewhere otherwise JIRAs documentation wouldn't exist.
Here is a suggested route you might take...
Jira does provide a wadl description at https://docs.atlassian.com/jira/REST/server/jira-rest-plugin.wadl
so perhaps you can covert it into swagger.json via https://apimatic.io/transformer
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