Custom fields won't appear on the store admin side email

I added some custom fields into the shipping form by using MP Custom Shipping Form 1.1.3
And I'd like to see all the custom fields in the notification emails. For that, I added "MPCSFDETAILS" at
Products>Store setting>Messages>Email notification.

The custom fields value appeared on the email which was sent to customer side.
But It did not appear on the email that was sent to the store admin side.
How can I show these custom fields on the store admin side email?