How to modify data selected in notifications

First thing to do is finding workflows name:wf_item_type; standard workflows writes wf_item_key and wf_item_type to the standard tables or from application purchasing>document types>w_item_type can be seen for workflows. Then via workflow builder>wf_item_type>notifications>messages>body related variable can be seen. Another way is directly searching in related package by finding activity and procedure names in workflow status monitor.