MathML is the "native" ConTeXt way of math. Here's the docs:
- MathML (general) by Pragma
- MathML in ConTeXt (examples) by Pragma
- ChemML (MathML extension for chemistry) (screen) by Pragma
- PhysML (MathML extension for physics) (screen) by Pragma
- Steps (XML step charts) (screen) by Pragma