I want to get the tittle of collections in my firebase project to a select, but i only get the responde inside the collection i want that the select show titles of picture #1

This is my code i use vuejs:

import Firebase from "firebase";
import { configFirebasecalidair } from "../../../constants/config";
let app = Firebase.initializeApp(configFirebasecalidair, "calidair");
let db = app.database();
let datacalidairef = db
  .ref("CalidAir/")
  .limitToLast(20);
datacalidairef.on("value", (snapshot) => {
      const data = snapshot.val();


  for (let key in data){
      sensors.push(data[key]);
  }
  me.resultsensors = data
  console.log('Resultados',data);
  console.log('sensorelista',sensors);

})

and this is my response