[WP][WooCommerce] Add SKU next to Variation ID in Admin Metabox

woocommerce_custom.php

<?php
// Add SKU next to variation ID
function display_sku_next_to_var_ids() {
    ?>
    <script type="text/javascript">
        jQuery(function($) {
            "use strict";
            $(document).on('woocommerce_variations_loaded', function(event) {
                var id = -1;
                $('.woocommerce_variation.wc-metabox').each( function(index, elem) {
                    id++;
                    var var_id = $(elem).find('#variable_sku'+id).val();
                    $('h3 strong', this).after('<p style="display:inline;"> - SKU: <strong>'+var_id+'</strong></p>');
                });
            });
        });
    </script>
    <?php
}
add_action( 'admin_print_scripts', 'display_sku_next_to_var_ids', 999);
?>