Hi,

Yes. You can use the built-in WooCommerce hooks for that.

Checkout the WooCommerce hook "woocommerce_email_after_order_table".

Full list with the WooCommerce hooks can be seen here: https://woocommerce.github.io/code-reference/hooks/hooks.html

Filter example:

add_action('woocommerce_order_details_after_order_table', function (\WC_Order $order) {
    // Get products from this order
    $items = $order->get_items();
    // Loop each product and check if the product has event_id meta attached to it
    foreach ($items as $item) {

        $event_id = $item->get_meta('event_id');
        if (false !== filter_var($item->get_meta('event_id'), FILTER_VALIDATE_INT)) {
            // Obtain the event object from the id
            // For more info about the Event_Post object check \assets\php\o.event.php file
            $event = new \Stachethemes\Stec\Event_Post($event_id); 
            
            // Displays custom text in your email
            printf('Here is my custom info for event: %s', $event->get_title());
        }
    }
}, 11); // 11 so the text will appear below the "Calendar QR Code" text. If you need it before that set this value to 9