In case someone else is interested: .NET library for rendering mathematical formulae using the LaTeX typsetting style, for the WPF framework https://github.com/ForNeVeR/wpf-math
Didn't look good but using the same idea, I can create my own math renderer and markup language.
It's going to be a lot of work but I'm mostly likely going to pursue that. After hours of research, I haven't found other libraries. Besides the markup languages seem unnecessarily complicated.