Hello,
When I use
Version1: #renderCustomField($!issue, 'customfield_10138')
in JETI template, I get The user fullname plus its avatar. What I need is to show the email address of the user in this custom field. How can I achieve this?
#renderCustomField($!issue, 'customfield_10138').emailAddress returns empty string plus ".emailAdress". I'm lost! 
By the way $!issue.getCustomFieldValueAsObject('customfield_10138').displayName doesn't work either (it's empty).
Any help would be much appreciated!