Send custom email after checkout

-- HikaShop version -- : 4.4.0
-- Joomla version -- : 3.9.22
-- PHP version -- : 7.4.2
-- Browser(s) name and version -- : Firefox 81.0.2 (64-Bit)

Hi,

When a product is purchased, one email each is sent to the buyer and the seller. So far so good. However, we should be able to send an additional email with individual content to a third party (email address from a custom field).

Is this possible with HikaShop? If so how?

Regards,
Stefan