Good day @Artur_Butvilovsky and @grafifontis,
I am not staff and therefore cant give you specifics. I will however, can speak about this on a more generalization.
The staff and development teams at Webflow are on this as I write this. This has been a big feature request since the beginning of the e-commerce integration. I do know that in previous Vlad talks it has been brought that these features are coming. The next Vlad talk is Sept 10th, so if you can get on the live stream, you can ask your questions there as well. Stay tuned to their YouTube channel for updates.
As for the release date on these feature, I DO NOT have an answer for you there. I DO know that the e-commerce team is working diligently to get these features out to the public asap, but only when they know that it is working seamlessly and have the right functional purpose set forth.
I hope this eases your pain somewhat? I know its not really an answer, but it is all I have to give at the moment. There will be an announcement on the forum here when it will be available, plus in your dashboard when you sign on. In the meantime you can use Foxy.io which works with Webflow CMS or you can even integrate Ecwid into Webflow, which I have done on a few sites.
Have a great day fellas and lmk if you have any other questions. You can also few the status of these features at wishlist.webflow.com