How can I save a custom field of an attribute in Woocommerce?

Question

Old

I am trying to create a custom field in the product attributes in Woocommerce. This to be able to select if an attribute is highlighted or not. For example:

Answer 1

perfect code but change the hook

add_action('wp_ajax_woocommerce_save_attributes', 'wcb_ajax_woocommerce_save_attributes', 10);

to

add_action('wp_ajax_woocommerce_save_attributes', 'wcb_ajax_woocommerce_save_attributes', 0);