3D Creation Question

I want to create a game with 3D platform game using gdevelop. How can I do that?

Long answer: There is no native 3D support in GDevelop.
Short answer: You cannot.

but in gdevelop4 i can? Can i do it in gdevelop5?

When 3D will be supported in GDevelop5?

GDevelop is a 2D-centric engine, we strive to provide a fast and easy to use engine for everyone.
3D is a totally different world, there are many things to do in 2D, exploring another world is not planned.