Maybe this program could help you.
https://github.com/Experiment5X/BIG-File-Extractor
Here's more info about it https://zenhax.com/viewtopic.php?t=11568
It apparently has the script you are looking for.
Good luck, man. I hope you will be able to make the rosters for this great console. I was trying to make an updated roster in game since i don't know how to use the pc programs and it takes an eternity.
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