How to add woocommerce custom order data?

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add_action( 'woocommerce_process_shop_order_meta', 'add_custom_order_data' );
function add_custom_order_data( $order_id ) {
    // Get the order object
    $order = new WC_Order( $order_id );

    // Add custom order data
    $custom_field_value = get_post_meta( $order_id, '_custom_field', true );
    if ( ! empty( $custom_field_value ) ) {
        $order->add_order_note( 'Custom field: ' . $custom_field_value );
    }
}

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add_action( 'woocommerce_checkout_create_order', 'save_custom_order_data' );
function save_custom_order_data( $order ) {
    $custom_field_value = sanitize_text_field( $_POST['custom_field'] );
    $order->update_meta_data( '_custom_field', $custom_field_value );
}

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add_action( 'woocommerce_order_details_after_order_table', 'display_custom_order_data' );
function display_custom_order_data( $order ) {
    $custom_field_value = get_post_meta( $order->get_id(), '_custom_field', true );
    if ( ! empty( $custom_field_value ) ) {
        echo '<p><strong>Custom Field:</strong> ' . $custom_field_value . '</p>';
    }
}