Show parent on issue view

[ankitpokhrel]

Update:

I'd like to append to this request the ability to view the parent linkage in jira issue view. I currently have a workflow that runs against a board and audits that everything is sorted into the correct swim lanes. One of the triggers preventing this from working fully as it could is that if a ticket doesn't have a parent linked, it would get sorted to column A, and if it does to column B. For my use case in particular, I would only need a binary "has parent" / "doesn't have parent" level of detail, but the most sensible I think would be in the first line of the banner for jira issue view --plain that would show something to the effect of 👪 BRD-12345 (not really a great emoji for parent, but you get the idea).

It looks like the parent field is accessible in the V2 Get Issue endpoint via:
curl -H <headers> -u <user:pass> <base_url>/rest/api/2/issue/<issue_id> | jq -r '.fields.parent.key'

The documentation only mentions "Parent" through .fields.["sub-tasks"] | select(.type.inward == "parent"), though that field is empty on tickets I've tried with parents.

Originally posted by @tj-smith47 in #714 (comment)