MathJax 2.7.7 fails to load mathtools package

Is it possible to use a more recent version of MathJax (v3)? The current version lacks support for advanced LaTeX commands like \mathclap (mathtools) and others. Upgrading would help a lot with complex notation in exported notebooks to HTML. I am trying to include the package in index.html.j2, but without success so far.

Is there any workaround to make it work?

Thanks.
