Importing scene with camera background in blender to threejs

Hi I’m working on a threes project with a character that moves with a click and go mouse system. I need to make a ground with a background ( to make it look real) in blender. I want to export the blender scene with the floor material that have the navmesh to it with the camera and background image.

I tried to explain it the best I can , I attached a photo to make it easier to understand