we can show math and chart in markdown with java scripts help.
add those two in your head.html using liquid template.
Mermaid flowchart
<script src="//cdn.rawgit.com/knsv/mermaid/master/dist/mermaid.min.js"></script>
<link rel="stylesheet" href="//cdn.rawgit.com/knsv/mermaid/master/dist/mermaid.css">
<script>mermaid.initialize({startOnLoad:true});</script>
<script type="text/javascript" src="//cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
</script>mathjax support
{% if site.enable_mathjax %} {% endif %}