РЕДАКТИРОВАТЬ: add_action ('woocommerce_after_product_attribute_settings', 'mytheme_woo_add_custom_fields');
Этот хук подходит близко, но я думаю, не совсем то, что вы ищете. Может быть, вы можете продолжить это?
// Attributes tab
add_action( 'woocommerce_product_options_attributes', 'mytheme_woo_add_custom_fields' ); // After all Attributes default fields
Источник: https://gist.github.com/maddisondesigns/e7ee7eef7588bbba2f6d024a11e8875a
// General Tab
add_action( 'woocommerce_product_options_pricing', 'mytheme_woo_add_custom_fields' ); // After pricing fields
add_action( 'woocommerce_product_options_downloads', 'mytheme_woo_add_custom_fields' ); // After downloadable file fields and only visible when it's a downloable product
add_action( 'woocommerce_product_options_tax', 'mytheme_woo_add_custom_fields' ); // After tax fields
add_action( 'woocommerce_product_options_general_product_data', 'mytheme_woo_add_custom_fields' ); // After all General default fields
// Inventory tab
add_action( 'woocommerce_product_options_sku', 'mytheme_woo_add_custom_fields' ); // After SKU field
add_action( 'woocommerce_product_options_stock', 'mytheme_woo_add_custom_fields' ); // After Manage Stock field
add_action( 'woocommerce_product_options_stock_fields', 'mytheme_woo_add_custom_fields' ); // After Manage Stock field but only visible is checked
add_action( 'woocommerce_product_options_stock_status', 'mytheme_woo_add_custom_fields' ); // After Stock Status field
add_action( 'woocommerce_product_options_sold_individually', 'mytheme_woo_add_custom_fields' ); // After Sold Individually field
add_action( 'woocommerce_product_options_inventory_product_data', 'mytheme_woo_add_custom_fields' ); // After all Inventory default fields
// Shipping tab
add_action( 'woocommerce_product_options_dimensions', 'mytheme_woo_add_custom_fields' ); // After Dimensions field
add_action( 'woocommerce_product_options_shipping', 'mytheme_woo_add_custom_fields' ); // After all Shipping default fields
// Linked Products tab
add_action( 'woocommerce_product_options_related', 'mytheme_woo_add_custom_fields' ); // After all Linked Products default fields
// Attributes tab
add_action( 'woocommerce_product_options_attributes', 'mytheme_woo_add_custom_fields' ); // After all Attributes default fields
// Advanced tab
add_action( 'woocommerce_product_options_reviews', 'mytheme_woo_add_custom_fields' ); // After Enable Reviews field
add_action( 'woocommerce_product_options_advanced', 'mytheme_woo_add_custom_fields' ); // After all Advanced default fields
// Variations tab
add_action( 'woocommerce_variation_options', 'mytheme_woo_add_custom_variation_fields', 10, 3 ); // After variation Enabled/Downloadable/Virtual/Manage Stock checkboxes
add_action( 'woocommerce_variation_options_pricing', 'mytheme_woo_add_custom_variation_fields', 10, 3 ); // After Price fields
add_action( 'woocommerce_variation_options_inventory', 'mytheme_woo_add_custom_variation_fields', 10, 3 ); // After Manage Stock fields
add_action( 'woocommerce_variation_options_dimensions', 'mytheme_woo_add_custom_variation_fields', 10, 3 ); // After Weight/Dimension fields
add_action( 'woocommerce_variation_options_tax', 'mytheme_woo_add_custom_variation_fields', 10, 3 ); // After Shipping/Tax Class fields
add_action( 'woocommerce_variation_options_download', 'mytheme_woo_add_custom_variation_fields', 10, 3 ); // After Download fields
add_action( 'woocommerce_product_after_variable_attributes', 'mytheme_woo_add_custom_variation_fields', 10, 3 ); // After all Variation fields