This turns a Linux container into a bootable Linux OS.
If your container starts a GUI environment and launches a browser pointed to your React app I see no reason to think that wouldn't work after making it bootable.
It sounds like you're expecting it to be some kind of OS of its own though, that it would automatically drop straight in to code you give it somehow. That's not what it is.
If you're looking to build a bootable kiosk sort of thing, the old-school way was just a service file that ran xinit -- chromium --kiosk http://localhost/whatever. (no idea how to express that in wayland.) It's not locked down as much as you'd hope and there are a lot of details, but starting with that and letting the error messages guide your way is a workable approach...