Hi Nilam,
In Emails you also have a Preparation where you can add queries and populate widgets like on normal Traditional Web screens.
For example, I have here a query on the Preparation of the email:

And then on the email, I have a list binded to the query showing the name:

I think this would be way easier and more intuitive than passing a JSON to the email.
Hope it helps.
Cheers,
João