Support for wildcard for custom fields

HI,

I have installed Automation JIRA for lite version and created one rule. When a comment is added to an issue them mail will be sent to some members.

for this, I have created one email template, So I want to add comment contains in that mail also issue related details and values of the custom fields. 

for this, I need wildcard list of all issue related fields( other than this $issue, $issue.summary or $issue.description.).

Regards,

Akshay Thakare