How to show price incl. VAT in the "Order creation notification" email

-- url of the page with the problem -- : www.mangialarossa.com/index.php
-- HikaShop version -- : 3.2.1
-- Joomla version -- : 3.7.5
-- PHP version -- : 7.0
-- Browser(s) name and version -- : firefox

Hi,
I would like to show only prices including VAT in the email received by the client after the order is placed. During the check out it is already set (I added the code $this->params->set('price_with_tax',1); to force it on the checkout page regardless of the setting). How to have the same in the email?
Referring to the attachment, I would like to have
Totale incl. IVA 6,00 €
instead of
Totale incl. IVA 5,45 €

Thanks in advance
Imma

Thanks!!