Yeah, I am aware of schemas, I meant something where you would have, for example, a conf.definition.json file:

{
    screenResolution: {
             definition: "What resolution the screen should be",
             options: [ 
                 "1920x1080",
                  "720x470"
              ]
     }
}

So then, a settings app could control settings for other programs, like apple does, by checking this file, and editing the configuration file based on it.