Let us talk about details.
1st thing one needs to have is a complete understanding of the obj format.
It's a text file yes but do you REALLY understand how it works?
Then you need to have a complete understanding of how those files are adjusted and stored in a GR2 file.
Pretty sure very few reading this do know. You see what is exported and probably don't even look at the files in a text editor.
Even if you do it's Greek.
(Another salute to the Name!
)