loop a var key in a res.json response

so this is the portion of my code :

var roomid= roomIds[i] 
const Availabilitydata = await AvailResponse.json();
    availableroomsArray.push(Availabilitydata);
    
        app.get("/api/availability", (req, res) => {
            res.json({ indicateur: availableroomsArray});});
    }

so the variable indicateur looping 3 rooms Ids in an array
so when you visit /api/availability it will print the availibility of the 3 rooms in 2022-03-20 this way

{"indicateur":[{"20220320":{"i":1,"p1":"74.00","p2":"78.00","p3":"70.3000","p4":"122.4600"},"20220320"{"i":0,"p1":"74.00","p2":"77.00","p3":"70.3000","p4":"120.8900"},"20220320":{"i":0,"p1":"65.00","p2":"68.00","p3":"61.7500","p4":"106.7600"}}]}

and it is working fine .

What i am trying to achieve is displaying the roomId of each room in front of its availability like this :

{"1212":[{"20220320":{"i":1,"p1":"74.00","p2":"78.00","p3":"70.3000","p4":"122.4600"}]},
{"1213":[{"20220320"{"i":0,"p1":"74.00","p2":"77.00","p3":"70.3000","p4":"120.8900"}]},
{"1214":[{""20220320":{"i":0,"p1":"65.00","p2":"68.00","p3":"61.7500","p4":"106.7600"}}]}

I tried to replace indicateur in res.json({ indicateur: availableroomsArray});}); by roomid but it will be printed as it is