how to import obj with 2 materials on it

So i have this cave in blender, i used mix shader to combine 2 texture, one for floor another for the walls, and when i import it to unity i can only place one material on the object.




i used vertex paint to do it

 

You'd need to recreate the same shader in Unity. I don't believe Unity has a built-in shader that blends two textures using vertex colors. Maybe the terrain shader might do something similar but I'm not sure how that works.