Hello,
It is more flexible in HikaShop 3 (and 2.x)
You can create custom blocks using plugins ; which allow you to display and do whatever you want in the checkout.
And the new checkout system handle new kind of blocks, like "text". Unfortunately, that part of the development is not fully finished and there is no interface to configure the new checkout structure for the moment (After one year and an half of development ; we had to place limits in what we wanted to release for the 3.0.0 version).
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.