Not able to render variables in Newman Extra HTML Reporter

Hi Team,
I am using newman html extra reporter, in this i am using default template provided by danny, on dashboard template i want to add few more variables, after adding those variables i am not able to render values of those variables on UI, but i can see those variables name, the values i am trying to populate from external json file, what should i do? Is there any specific command also i need to pass while while running via newman, to populate those values