Load ipynb contained from a different directory

Let us suppose my main notebook (main.ipynb) is next to a folder otherpath containing another notebook to be imported (to_be_imported.ipynb).

If I do
`import ipynb.fs.defs.otherpath.to_be_imported`

I get
`ModuleNotFoundError: No module named 'ipynb.fs.defs.otherpath'`

If I move to_be_imported.ipynb in the same folder of the main file, everything works.