[Question] Highlighting Scheme Specification

[kevinmatthes]

I would like to add new modes to Zee but Tree-Sitters which actually specify a highlights.scm are pretty rare. I thought about writing them myself for the respective Tree-Sitters and suggesting them for integration into the fall-back directory.

My question is about the starting point(s) to get a basic idea of how these files should be specified, especially which minimum requirements need to be fulfilled.