woocommerce group product items as bundle

function set_product_items_as_bundle($bundle_id)
{
    $product_items = $this->get_product_items($bundle_id);
    
    foreach ($product_items as $product_item) {
        $product_id = $product_item->product_id;
        wp_set_post_terms($product_id, $bundle_id, 'product_type', false);
    }
}