Option to dynamically enter email body text in XML publisher

Hi

We are using Bursting in XML publisher to send the invoices to the customers on email.

Now there is a requirement where the business user wants and option to configure the Subject & Email body text before sending the invoice email.

As per what I understand, it the bursting file only supports one static text. Is there any way in Oracle EBS(standard/simple customization) that  we can provide a business user with an option to dynamically enter the subject or email body before bursting.

Thanks
Mithun P J