I figured out the reason I couldn't get it to work is because I was trying with a Level 5 game. Apparently they store data differently, and I've yet to find any guides on how to extract it.
So yeah, I've been trying to do that but all the tutorials and tools I've found seem to be outdated and don't work with luma/godmode9 generated cia file I have. If someone could point me in the right direction I'd appreciate it.