Hey I don’t know if you could solve this but I have find a way to do it.
$w('#dataset1').onReady(function(){
var total = 0;
for (var i = 0; i < $w('#table1').rows.length; i++) {
console.log($w('#table1').rows[i]["total"]);
total = Number(total) + Number($w('#table1').rows[i]["total"]);
console.log ("Total:" + total);
}
$w('#text12').text = String("$" + total);
});