Not able to take field value in email body sentinl kibanaplugin

I have installed sentinl kibana plugin for alerting. I am trying to send email using sentinl and in email body i have to take some fields from selected index . How can i take index fields in email body? Please help.
I tried with {{fieldname}} but not worked .
Example {{resolve.rtt.us}}

Hello,
Sadly, Sentinel isn't a plugin supported by the Elastic team. You should ask on their forums as they should be able to help.