I use send2unreal and it works, thanks 
The thing is how to create human character, assign rig to it, export to Unreal (I already know it, thanks to send2unreal plugin) and animate with a help of Control Rig in UE5. It seems I need to work with a bone chains assignment (new mechanism).
Let me try to formulate a question. Here I have modelled a simple animal model and added bones. I exported it to Unreal. Next, I need to somehow create a Control Rig. That’s where it’s hard to understand what to do next to create a new animation with it.
And it’s the same with a human.
Another thing that confuses me is the notion of “retargeting”. Do I need it or not?