That would frankly be impossible. All JSX boils down to is h(name, properties, children) and that is literally it. Each reconciler is different, uses another v-dom, etc. If you wanted to patent react, you patent the mere use of functions. And not just that there are about 20 years of fair use of similar principles, even for jsx in particular which evolved from mozillas e4x and otherwise keeps to basic xml markup and mustaches.
Also impossible because JSX is independent of React. The specification is only subject to a standard Copyright and is released under the Creative Commons Attribution 4.0 International license.
