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Hi @Sergej_Gurenko 

Let's be clear about the term "dynamic object" I actually blame our own @Kaspars_Zibarts for this confusion, because his post subject should say UPDATABLE objects, not DYNAMIC objects.

Updatable objects are just that, a logical list of IPs from external feeds.

You really need something else, and we do call it a "dynamic object". It is in essence a logical container defined on the GW itself via CLI commands. It preceded Updatable Objects for a couple of decades, actually. 

Please look on the CLI syntax for dynamic objects in the documentation. However, since the tech is a bit old, you will have to write your own scripts to automate it.

If you are looking for something with less automation effort, there is another thing you can leverage - Generic Data Center Objects. You will be able to feed info into json file to control it.