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 = [];

for(var i=0; i<data.length; i++){
	newdata.push({data: []});
	for(var j=0; j<data[i].data.length; j++){
  	var keys = Object.keys(data[i].data[j]);
    var temp = [];
    for(var k in keys){
    	temp.push(data[i].data[j][keys[k]]);
    }
    newdata[i].data.push(temp);
  }
}

console.log(JSON.stringify(newdata));