以下是在管理员编辑产品页面中添加2个自定义字段（编辑器所见即所得）并在前端单个产品页面自定义选项卡中显示值的方法：

## ---- 1. Backend ---- ##

// Adding a custom Meta container to admin products pages
add_action( 'add_meta_boxes', 'create_custom_meta_box' );
if ( ! function_exists( 'create_custom_meta_box' ) )
{
    function create_custom_meta_box()
    {
        add_meta_box(
            'custom_product_meta_box',
            __( 'Additional Product Information <em>(optional)</em>', 'cmb' ),
            'add_custom_content_meta_box',
            'product',
            'normal',
            'default'
        );
    }
}

//  Custom metabox content in admin product pages
if ( ! function_exists( 'add_custom_content_meta_box' ) ){
    function add_custom_content_meta_box( $post ){
        $prefix = '_bhww_'; // global $prefix;

        $ingredients = get_post_meta($post->ID, $prefix.'ingredients_wysiwyg', true) ? get_post_meta($post->ID, $prefix.'ingredients_wysiwyg', true) : '';
        $benefits = get_post_meta($post->ID, $prefix.'benefits_wysiwyg', true) ? get_post_meta($post->ID, $prefix.'benefits_wysiwyg', true) : '';
        $args['textarea_rows'] = 6;

        echo '<p>'.__( 'Ingredients', 'cmb' ).'</p>';
        wp_editor( $ingredients, 'ingredients_wysiwyg', $args );

        echo '<p>'.__( 'Benefits', 'cmb' ).'</p>';
        wp_editor( $benefits, 'benefits_wysiwyg', $args );

        echo '<input type="hidden" name="custom_product_field_nonce" value="' . wp_create_nonce() . '">';
    }
}


//Save the data of the Meta field
add_action( 'save_post', 'save_custom_content_meta_box', 10, 1 );
if ( ! function_exists( 'save_custom_content_meta_box' ) )
{

    function save_custom_content_meta_box( $post_id ) {
        $prefix = '_bhww_'; // global $prefix;

        // We need to verify this with the proper authorization (security stuff).

        // Check if our nonce is set.
        if ( ! isset( $_POST[ 'custom_product_field_nonce' ] ) ) {
            return $post_id;
        }
        $nonce = $_REQUEST[ 'custom_product_field_nonce' ];

        //Verify that the nonce is valid.
        if ( ! wp_verify_nonce( $nonce ) ) {
            return $post_id;
        }

        // If this is an autosave, our form has not been submitted, so we don't want to do anything.
        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
            return $post_id;
        }

        // Check the user's permissions.
        if ( 'product' == $_POST[ 'post_type' ] ){
            if ( ! current_user_can( 'edit_product', $post_id ) )
                return $post_id;
        } else {
            if ( ! current_user_can( 'edit_post', $post_id ) )
                return $post_id;
        }

        // Sanitize user input and update the meta field in the database.
        update_post_meta( $post_id, $prefix.'ingredients_wysiwyg', wp_kses_post($_POST[ 'ingredients_wysiwyg' ]) );
        update_post_meta( $post_id, $prefix.'benefits_wysiwyg', wp_kses_post($_POST[ 'benefits_wysiwyg' ]) );
    }
}

## ---- 2. Front-end ---- ##

// Create custom tabs in product single pages
add_filter( 'woocommerce_product_tabs', 'custom_product_tabs' );
function custom_product_tabs( $tabs ) {
    global $post;

    $product_ingredients = get_post_meta( $post->ID, '_bhww_ingredients_wysiwyg', true );
    $product_benefits    = get_post_meta( $post->ID, '_bhww_benefits_wysiwyg', true );

    if ( ! empty( $product_ingredients ) )
        $tabs['ingredients_tab'] = array(
            'title'    => __( 'Ingredients', 'woocommerce' ),
            'priority' => 45,
            'callback' => 'ingredients_product_tab_content'
        );

    if ( ! empty( $product_benefits ) )
        $tabs['benefits_tab'] = array(
            'title'    => __( 'Benefits', 'woocommerce' ),
            'priority' => 50,
            'callback' => 'benefits_product_tab_content'
        );

    return $tabs;
}

// Add content to custom tab in product single pages (1)
function ingredients_product_tab_content() {
    global $post;

    $product_ingredients = get_post_meta( $post->ID, '_bhww_ingredients_wysiwyg', true );

    if ( ! empty( $product_ingredients ) ) {
        echo '<h2>' . __( 'Product Ingredients', 'woocommerce' ) . '</h2>';

        // Updated to apply the_content filter to WYSIWYG content
        echo apply_filters( 'the_content', $product_ingredients );
    }
}

// Add content to custom tab in product single pages (2)
function benefits_product_tab_content() {
    global $post;

    $product_benefits = get_post_meta( $post->ID, '_bhww_benefits_wysiwyg', true );

    if ( ! empty( $product_benefits ) ) {
        echo '<h2>' . __( 'Product Benefits', 'woocommerce' ) . '</h2>';

        // Updated to apply the_content filter to WYSIWYG content
        echo apply_filters( 'the_content', $product_benefits );
    }
}

• 代码在您的活动子主题（或主题）的function.php文件或任何插件文件中。*

经过测试并有效。您将获得：
1)后端：

2)在前端：