You can insert a MathJax equation by creating a new Quill module. It is detailed on this page:
https://lucidar.me/en/rich-content-editor/mathjax-and-quill-editor/
Don't have WYSIWYG math input working, but you can see how MathJax with Latex entry can work well with Quilljs in an extension to the Jupyter notebook we are working on. See the opening post to this Jupyter discussion and the link to a brief screencast of it working. For now you will have to look at the repositories or install to develop:
https://github.com/ColinGutow/notebook (the working branch is 'withQuill'). https://github.com/ColinGutow/nbformat
I have no idea if this will help you, but it shows it is possible.
Regards
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