JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = [
  {
    "data" : [
          {
            "month" : 1,
             "name" : "Alex",
             "sum" : 20
          }
      ]  
  },
  {
    "data" : [
          {
            "month" : 2,
             "name" : "Zara",
             "sum" : 18
          },
          {
            "month" : 2,
            "name" : "Zara",
            "sum" : 19
          }
      ]  
  }];

var newdata = [];

$.each(data, function(i, v){
	newdata.push({data: []});
  var temp = [];
	$.each(v.data, function(k, val){
  	var keys = Object.keys(v.data[k]);
 		$.each(keys, function(j){
    	temp.push(v.data[k][keys[j]]);
    });
		newdata[i].data.push(temp);
    temp = [];
  });
});
console.log(JSON.stringify(newdata));