Gravity form pre populate hidden fields

add_filter( 'gform_pre_render_2', 'newchip_gform_pre_render' );
function newchip_gform_pre_render( $form ) {
    $form_id = $form['id'];
    if ( empty( $_POST[ 'is_submit_' . $form_id ] ) && class_exists( 'WooCommerce' ) ) {
        $order_statuses = array('wc-on-hold', 'wc-processing', 'wc-completed');
        $customer_user_id = get_current_user_id(); // current user ID here for example
        // Getting current customer orders
        $customer_orders = wc_get_orders( array(
            'meta_key' => '_customer_user',
            'meta_value' => $customer_user_id,
            'post_status' => $order_statuses,
            'numberposts' => 1
        ) );

        foreach($customer_orders as $order ){

            // Order ID (added WooCommerce 3+ compatibility)
            $order_created_date = $order->get_date_created();
            $order_id = method_exists( $order, 'get_id' ) ? $order->get_id() : $order->id;

            // Iterating through current orders items
            foreach($order->get_items() as $item_id => $item){
                $product_name = method_exists( $item, 'get_name' ) ? $item->get_name() : $item['name'];
            }
        }
        foreach ( $form['fields'] as &$field ) {
            if ( $field->id == 6 ) {
                $field->defaultValue = $product_name;
            }
            if ( $field->id == 7 ) {
                $field->defaultValue = $order_created_date;
            }
        }

    }
    return $form;
}