In what system and where?
I'm taking a guess that the target is Jira, but where are you trying to do this? As you're saying JSON, I'm guessing REST, in which case, you can't because it's not available yet (unless I've misunderstood https://docs.atlassian.com/jira/REST/latest/ ).
But I'm really not sure, because there's not enough information in your question.
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Ah, you missed the point I made about REST.
The reason you can't find a JSON format is that there is no function to do this. Unless I have missed it in that page.
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"In what system and where" is exactly what it says. What system are you doing this in? Where is the code being run? Your previous answer actually answers those questions fine.
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