Add the slug to attribute selectbox in the WooCommerce product editing page

add-slug-to-attribute-search-result.php

<?php

/**
 * When you have a lot of values in an attribute and some of them have similar names,
 * choosing the right value in the attribute field in the product information box is a pain and there is a high chance of mistakes.
 * One solution is to consider a different slug for each attribute.
 * But the problem is that when searching for values in attributes,
 * only the attribute name is displayed to you.
 * The code that follows helps you choose the right values by displaying the slug of each value (after its name).
 */
function ywp_modify_taxonomy_term_names( $terms, $taxonomy ) {
    foreach ( $terms as &$term ) {
        $decoded_slug = urldecode( $term->slug );
        $term->name   = $term->name . ' - ' . $decoded_slug;
    }
  
    return $terms;
}

add_filter( 'woocommerce_json_search_found_product_attribute_terms', 'ywp_modify_taxonomy_term_names', 10, 2 );

// The code goes to your active theme/child theme functions.php file.
// TESTED AND WORKING.