JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="result">
</div>

JavaScript

var array_iva = [];

var data = { "impo": 10, "aliq": 20, "other": 30 };
var column = { "title": "TEST 1", "data": data };
array_iva.push(column);

var data = { "impo": 40, "aliq": 50, "other": 60 };
var column = { "title": "TEST 2", "data": data };
array_iva.push(column);

var json_righe = [[ "Imponibile lordo" ], [ "Aliquota %" ], [ "Others" ] ];

for ( var i = 0; i < array_iva.length; i++ ) {

var titolo_colonna_iva = {};

titolo_colonna_iva['title'] = array_iva[i]['title'];

for ( j = 0; j < json_righe.length; j++ ) { //  for each 

    var riga = json_righe[j];

    for ( var k = 0; k < array_iva.length; k++ ) {  //  EMPTY DEFAULT
        riga.push("");
    }

    //	ACTUAL FIX

    if ( j == 0 ) {
        riga[(i+1)] = array_iva[i]['data']['impo'];
    } else if ( j == 1 ) {
        riga[(i+1)] = array_iva[i]['data']['aliq'];
    } else if ( j == 2 ) {
        riga[(i+1)] = array_iva[i]['data']['other'];
    }

	  //END ACTUAL FIX
    
    /*
    THIS DOESn?T WORK
    riga[(i+1)] = array_iva[i]['data'][j];
    */

    json_righe[j] = riga;

}

}

$("#result").html(JSON.stringify(json_righe));