I made something very similar in 2004. Instead of JSON, you would supply PHP arrays. The enabled to mix in some conditional code and make it more flexible for d

I made something very similar in 2004. Instead of JSON, you would supply PHP arrays. The enabled to mix in some conditional code and make it more flexible for different usage patterns. We shipped a pretty big ERP application this way. I have since left the company, but the software still works on 200+ installations.