There is no way to customize the notification email template that you can opt to receive on behalf of the organization. While you can customize the confirmation email template that gets sent to the donor after they make an online gift via DIY Form, unfortunately this same level of customization is NOT available with the notification email that you can opt to receive on behalf of the org for each online submission made through a DIY Form. The email template sent to the org is a standard/preset template that cannot be modified or changed in any way.