add text after quantity field hook (from Yigit)

hi
reffearing this post : https://kriesi.at/support/topic/add-text-between-quantity-and-add-to-cart-button-product-page/
I need a hook on the code from Yigit, this code is perfect but i need it to display ONLY for 2 products ;

function add_custom_tooltip(){
?>
<script>
jQuery(window).load(function(){
jQuery(‘.single .quantity’).append(‘<span class=”custom-attr”> Meter</span>’);
});
</script>
<?php
}
add_action(‘wp_footer’, ‘add_custom_tooltip’);

Thanks for your help!