They’re formatted by XZ. So  is 0,0 and  is 0,1. I’ll need to call tostring after doing math to be able to access negative chunk coordinates. But that isn’t important right now.
Anyways, I just need help writing or atleast some guidance on how to start writing something like this. I’m thinking there’s an easy math solution, but I don’t know where to start as I’ve never done something like this before.
This is known as neighbors, just add and minus the xy coordinates to get the next chunk like @DenisxdX3 said. Here was my implementation, your definitions of up,right,left,down might vary depending on how you view the Axis: