OK so finally it is. Voxel Sandbox ToolKit for Unreal Engine!
https://sellfy.com/p/Ho2F/
I am writing right now Online Documentation explaining everything:
C++ world generation, noises, trees, instances (flowers, grass, mushrooms)
Blueprting changing voxel size, textures, material, effects, character, UMG and more
The documentation should be avaiable in next few days.