Wordpress Create Custom Field in Wordpress Menu

//Adds custom data field form
function wpse_259995_menu_custom_fields_fields( $id, $item, $depth, $args ) {

	$_key = 'img_url';
	$label = "Image URL";
	$key   = sprintf( 'menu-item-%s', $_key );
	$id    = sprintf( 'edit-%s-%s', $key, $item->ID );
	$name  = sprintf( '%s[%s]', $key, $item->ID );
	$value = get_post_meta( $item->ID, $key, true );
	$class = sprintf( 'field-%s', $_key );
  
	printf(
	  '<p class="%5$s"><label for="%1$s">%2$s<br />
	  <input type="text" id="%1$s" class="%5$s" name="%3$s" value="%4$s" /></label></p>',
	  esc_attr( $id ),
	  esc_html( $label ),
	  esc_attr( $name ),
	  esc_url( $value ),
	  esc_attr( $class )
	);
  }
  add_action( 'wp_nav_menu_item_custom_fields', 'wpse_259995_menu_custom_fields_fields', 10, 4 );
  
  //Save Custom Menu data
  function wpse_259995_menu_custom_fields_save( $menu_id, $menu_item_db_id, $menu_item_args ) {
	if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) {
	  return;
	}
  
	check_admin_referer( 'update-nav_menu', 'update-nav-menu-nonce' );
	$_key = 'img_url';
	$label = "Image URL";
  
	$key = sprintf( 'menu-item-%s', $_key );
  
	// Sanitize
	if ( ! empty( $_POST[ $key ][ $menu_item_db_id ] ) ) {
	  // Do some checks here...
	  $value = $_POST[ $key ][ $menu_item_db_id ];
	}
	else {
	  $value = null;
	}
  
	// Update
	if ( ! is_null( $value ) ) {
	  update_post_meta( $menu_item_db_id, $key, $value );
	}
	else {
	  delete_post_meta( $menu_item_db_id, $key );
	}
  }
  add_action( 'wp_update_nav_menu_item', 'wpse_259995_menu_custom_fields_save', 10, 3 );
  
  //Adds toggle to show field in screen options
  function wpse_259995_menu_custom_fields_columns( $columns ) {
	$fields = array('img_url' => "Imae URL");
	$columns = array_merge( $columns, $fields );
	return $columns;
  }
  add_filter( 'manage_nav-menus_columns', 'wpse_259995_menu_custom_fields_columns', 99 );
  
  //Modify the element of the WP walker
  function wpse_259995_walker_nav_menu_start_el_menu_with_images ($item_output, $item, $depth, $args ){
	$attr_title  = ! empty( $item->attr_title ) ? $item->attr_title : $item->title;
  
	$img_url = get_post_meta( $item->ID, 'menu-item-img_url', true );
  
	$item_output = $args->before;
	$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . '<img src="'.$img_url.'" />' . $args->link_after;
	$item_output .= $args->after;
	return $item_output;
  }