Field code
issue?.comments[0]?.author?.accountId

Comments are stored in lists. Documentation on how to work with lists can be found here.

You can access the whole comment by issue.comments[0] which returns an object, issue.comments will return a list of objects.

Read

Returned valueThe author of the first comment of the issue, if comments are available.
Output data type

TEXT

Example output557068:145e0983-5707-439c-80e4-1160dd57g114

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