Add a custom tab into the Products Data metabox in Woocommerce - Products

functions.php

<?php
/** This filter function will add a custom tab to the Products Data metabox */
function add_my_custom_product_data_tab($product_data_tabs)
{
    $product_data_tabs['marketplace'] = array(
        'label' => __('Name of you custom tab', 'my_custom_text_domain'),
        'target' => 'my_custom_product_data',
    );
    return $product_data_tabs;
}
add_filter('woocommerce_product_data_tabs', 'add_my_custom_product_data_tab', 99, 1);
?>