If you really want to use the the JIRA native User Picker field, you just update the display name to contain the username as well... or maybe add the email address as well. I have done this with several JIRA instances that we support.
If you want to use a custom field, you may opt to use a "Scripted Field" and code something that will give what you need.
Did you solve this with your script?
We are trying to create a email html template with custom-fields. One of this fields should include the e-mail address of the reporter and another field should include the e-mail-address of the assignee. Till now i didnt find any solution.
mb some people would help this also.
If you try to show the e-mail address instead of the username in the notification:
If you try to show the full username in the notification:
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