Yeah I could do this, but then my configuration is split across several files, which reduces readability. As (luckily) JSON path doesn’t change across these sensors, I guess I might go this way.
(function(dataString) {
var data = JSON.parse(dataString);
var switchState = data.result.status;
if(switchState) return "ON";
if(!switchState) return "OFF";
})(input)