Hello,
The checkout cart do not display product custom fields because it have generally less space than the cart page and it also have the dynamic refresh which can be weird if the number of column change by adding a product.
It is currently not plan to display the product fields in the checkout cart ; but it is something you could see to add via an override.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.