Old post, but just in case, use the event action of any items integrated to a repeater :
export function whateverElement_onClick(event) {
let $item = $w.at(event.context)
const data = $w("#repeaterWhatever").data;
let clickedItemData = data.find(item => item._id === event.context.itemId)
//console.log(clickedItemData._id) == "MY165ID"}