Homebrew How to include project files like .obj

[MinedGamer]

Hi, I am making a 3d game.
The problem is this: how do I have the .obj files and other included in the rom file?

Is it done automatically?
Can it be accessed normally?
If not, can I add something in the makefile to do it?
If so, how can I access it?
If that doesn't work, how do I do it and how do I access the files.

Thanks in advance!