I modified notification message to a special format with merge tags. Works fine and goes to email as supposed with right values.
I'd also like to save this info to a file to server. I can't find this formatted message from any variable. Can this be re-used as it is? Now I would have to create this file again inside gform_after_submission and make changes twice if needed. It would be so cool to use that one message without modifying the hook every time.