WeChat mini apps are javascript model/controller with a markup view https://github.com/apelegri/wechat-mini-program-wiki Think angular & Vue instead of react. Each page has a js, json, stylesheet and xml.

You can technically hack one together but there's an annoying process of getting verified before you can use the IDE and test something on a phone. You also can't really publish anything and see how it goes without a serious plan and a Chinese national ID. There's a small scene of foreigners contributing to wechat apps and even starting some but ultimately control of the app is through a national.