Ah, I think I understand what you're asking now. If the cube was its own model in SU, positioned at 0/0/0, and not rotated at all, then it would come in more like you want it to, but from the looks of it, none of these things is true, and consequently, it is exported with an offset/rotation defined by how it is situated in your SU model. One way you may deal with this in Studio would be:
- 1. import the cube
2. open object Parameters > Coordinates
3. select the cube
4. click the 'Center' button
5. enable main menu > Edit > Rotate
6. use the rotate gizmo to align the pivot's axes as you wish
All objects have their own pivots, and you can change them using the steps above. Let me know if that helps to answer your question.