did u find a solution???
cuz am facing the same problem

you can add you library in __manifest__.py file as above.

Hi,
In your github repository, which is linked with odoo.sh project, add a file named requirements.txt and specify the needed python packages in it.

The specified packages, will be installed by odoo sh for you.

See: https://www.odoo.sh/faq

Python dependencies:

You can define requirements.txt files in your branch holding the python dependencies your project relies on. These requirements files can be placed in the root of the folders containing your addons. The platform will then install the dependencies for each build.

Thanks