Print receivables transaction Ess job bursting query

Hi all,

I have a requirement to edit the email body of the invoice email that is being sent after the ESS job has completed. As standard it is sending the email and the pdf attachment. The requirement is to edit the email body with similar information that is contained in the pdf, but placed within the email body and in that single email. From the functional setup of the email body, putting actual data fields is not allowed, just text.

Does anyone have any thoughts on what solution I could implement, to add the same information contained in the pdf attachment but within the email body in the singular email?