We use Jira Service Desk. It is integrated with our standard Jira project. When a ticket is entered into Jira Service Desk, after review, some magic happens and it ends up as a new ticket in our Jira project (I know nothing about that integration).
We'd like to include the Jira Service Desk Reporter in the Jira ticket. I don't think it can be the Reporter, since that field automatically gets filled in by whomever reviews the ticket. But it could be added to the Description, as a Comment, a custom field, etc.
I just have no idea where to map Service Desk fields to Jira fields.