JSFiddle - React, Tailwind, and code Playground

JavaScript

var response = {
   "result":"OK",
   "data":[
      {
         "number":"613-555-5555",
         "calls":30
      },
      {
         "number":"613-666-5555",
         "calls":100
      }
   ]
};
var final = response.data.map(function(v,i,a) {
    return [v.number, v.calls];
});
console.log(final);