You can use ordinary file functions to access them, and then theoretically you could try to do some embedding of local files, but I don’t think it’s a good way to solve this.
And if you don’t know javascript, an even worse idea. Sorry to say so.
I don’t understand the problem, it must be a technical one why full paths are supported (as in standard markdown) but not relative. I guess if it was an easy fix, it would have already been included.
In the Embed files thread there is another mention here.