Hi Ronnie,
Are you trying to add more information in e-mail notification of leave request?
Leave request send e-mail by using program "RPTARQEMAIL". If you want to change text in e-mail information, you need to use t-code SE61 to change it
Choose the document class Dialog Text.
You can try to send e-mail with more information by choosing radio button "With All document".
If you want to modify in workflow to send e-mail and get information in workflow, you can use key to find information from table start with "PTREQ*".
Hope it helps.
Soracha T.