QML/JS formatting should not format paramétrable object key

in JavaScript, it is possible to create object simply with "{ }". the format of object is similar to a map 

property var obj: {
   "key1": value1",
   "key2": value2"
}
console.log(JSON.stringify(obj))

But sometime, you need not only the value to be a variable but also the key. It's possible to do it with [...] directly in the object

property string key1: "property_name_1"
property string key2: "property_name_2"
property var obj: {
    [key1]: value1",
    [key2]: value2"
} 
console.log(JSON.stringify(obj))

But when you format the file, the [ ... ] will be replace by " ... " giving the wrong key