You can use jQuery to interact with ratings.
The following code will show a message, when the "heart" icon is clicked. For this we will use the categories ID to find it using jQuery.
AJS.toInit(function () {
setTimeout(function () {
jQuery('.content-rating-icon[data-category-id=2]').click(function () {
alert('Thank you.');
return true;
}
);
}, 1000);
})