I'm unaware of a JQL query that would get all the fields from an issue, however, you'll have better luck using the Rest API. You can test out the response with a curl such as the following:
curl -D- -u username:password -X GET -H "Content-Type: application/json" http://localhost:8080/rest/api/2/search?=jql=issue=BSM-9
If you would like to see the ability to get all the fields of an issue with JQL I would recommend creating a Suggestion on JAC for this. One you do that add the link to this thread so the community can vote on it and add impact!
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