Email "Neue Bestellung" bei der Produktübersicht eigene Felder (custom fields)

function variation_settings_fields( $loop, $variation_data, $variation ) {    // Text Field
    woocommerce_wp_text_input( 
        array( 
            'id'          => '_ean[' . $variation->ID . ']', 
            'label'       => __( 'EAN: ', 'woocommerce' ), 
            'placeholder' => '',
            'desc_tip'    => 'true',
            'description' => __( 'Bitte EAN Nummer eingeben', 'woocommerce' ),
            'value'       => get_post_meta( $variation->ID, '_ean', true )
        )
    );
}
/**
 * Save new fields for variations
 *
*/
function save_variation_settings_fields( $post_id ) {
    // Text Field
    $text_field = $_POST['_ean'][ $post_id ];
    if( ! empty( $text_field ) ) {
        update_post_meta( $post_id, '_ean', esc_attr( $text_field ) );
    }




}




add_filter( 'woocommerce_available_variation', 'load_variation_settings_fields' );
/**
 * Add custom fields for variations
 *
*/
function load_variation_settings_fields( $variations ) {
    
    // duplicate the line for each field
    $variations['ean'] = get_post_meta( $variations[ 'variation_id' ], '_ean', true );
    
    return $variations;
}