In Odoo Knowledge Articles, the rich text editor default to using numbering for all levels of ordered lists. This is confusing and contrary to just about every other implementation of this that I've run into. Is there a way to modify this behavior?

So, instead of:
1. First item
2. Second item
  1. First sub-item

I want to see something like:
1. First item
2. Second item
  a. First sub-item