Hello,
Yes the HikaShop insert product tag plugin is only made for HikaShop.
In order to have a similar feature for HikaMarket, best is to duplicate the plugin and made is just for HikaMarket context.
The main reason why we didn't create such plugin is that we don't see the context when vendors can edit articles from the front-end.
Such action is admin related.
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.