WooCommerce - Overide default address fields

<?php
  // WooCommerce - Overide default address fields
  add_filter( 'woocommerce_default_address_fields', 'wc_override_address_fields', PHP_INT_MAX );
  function wc_override_address_fields( $fields ) {
    $fields['address_1']['placeholder'] = 'Street Address';
    $fields['country']['placeholder'] = 'Country';
    return $fields;
   }