I would recommend TinyMCE and then some of your own adjustments

I wrote https://writer.math.dev , it supports markdown and latex

It can export to HTML and you can create your own custom stylesheets to do layout

You have to add the MathJax script & configuration to your HTML header (I probably should just put this in by default)

But my main point is that you can create your own workflow easy and I highly recommend you using TinyMCE as your input editor. It’s freaking super easy to use and super powerful