Is there a guide about .wwtl format?

It seems that there isn’t a guide about .wwtl format.
I want to edit my .wwtl file, but don’t know the structure, especially the part.

You can use the python package wwt_data_formats command “wwtdatatool cabinet unpack name.wwtl” to break up the layer file into an xml and then edit it. Using “wwtdatatool cabinet pack name.xml name_v2.wwtl” will let you create a new layer file