You can certainly use multiple fields. First get the current item, and then get each field that you want. Something like this:
$w.onReady( () => {
$w("#dynamicDataset").onReady( () => {
let item = $w("#dynamicDataset").getCurrentItem();
let field1 = item.field1;
let field2 = item.field2;
$w("#text569").text = "DIT WIL JE DOEN IN " + field1 + " " + field2 ;
} );
} );