It should be easy to convert that linear %
form to asciimath, basically just remove the %
and surround with backticks.
Using the MathJax version of Asciimath
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript"
src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-MML-AM_HTMLorMML">
</script>
<title></title>
</head>
<body>
`3*e^pi/5-3/5`
</body>
</html>
Produces