You would need something similar to this one…
$w.onReady(async function() {
$w('#REPEATER').onItemReady(($item, itemData, index)=>{
let inStock = itemData.inStock;
$w('#TEXTFIELD').text = inStock ;
if (inStock===true) {console.log("Yes, item is still in stock!);
if(lang = "EN") {console.log("English"); let myNewValue="xxxxx";}
else {console.log("Other language!");}
}
else {console.log("Item not in stock anymore!);
let myNewValue="yyyyy"
}
});
});