What I am building is along those lines. It's more geared towards dashboards, and button-based interactions. But technically, you can code whatever. Right now it's a desktop app, cause then you don't have to deploy a server and screw around with CORS, and all that. All the people that use it so far use for internal apps, so they're fine with that.

https://www.jigdev.com

Let me know if that could be of interest, and if yes, what the tool is missing.