custom filed names are added to bug type screen GEN project made by me
https://developer.atlassian.com/cloud/jira/platform/rest/v2/api-group-issues/#api-group-issues
You can use ?fields=key, assignee, issuetype. Etc to only return those bits or the whole ticket. Other options available.
You can do this in power automate, power query, postman and others.
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