how can change or add multiple path to "ansible python module location" variable?

after developing a dynamic inventory script in python3 that requires 3rd party modules installed in a different path (from ansible site-package) I realised that ansible is not able to import them (I guess because the variable mentioned in the subject does not include that path).

I would need to amend the content of that variable but I did not find any reference on the official ansible documentation.
is it possible?

thanks
alex