I'm having trouble with writing a pandoc python filter.

When I convert from markdown to docx I'm using a custom reference to set styles.
I can change most of the styles I want, except the bullet style, it isn't supported in the reference file. Default bullets only seem to only use "•" and "-" and repeats. I wanted to add a couple more bullets since my markdown file has a few levels.

If I read the docs correctly, the best way to do that would be to create a custom style and a filter to convert it. (but let me know if there is an easier way)
I made the custom style in the reference doc called "List Bullet" and if I surround my lists with a Div with the class name, it works for the first level at least.

I'm trying to make a python filter, but I am only just learning programming and I only know a very little python. I think this shouldn't be too hard to do, but I'm stuck. I've looked at a couple of the python examples, but I don't quite understand some things.

This is what I have so far. It works only on the first bullet of each list, and I sort of understand why but I do not know how to have it apply to the whole list and sub-lists. I also think I need to call each successive increment "List Bullet 2", "3" and so on.

FYI, got most of the code from the python filter examples on their github.