Hi,
It could be done using custom fields.
The vendor would be able to fill the custom field in the front-end and this value would be displayed directly in the website, without any modification.
Just create a "product custom field".
And you can use a text type of a zone type if you want to let the vendor select his country in the dropdown.
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.