There is a new app called PyDen which should allow you to install any module you need by creating a virtual environment from a compiled version of Python. You would need to do the following:
Install PyDen and PyDen Manager from Splunkbase
Ensure your system has all the required libraries to compile Python from source
Run the "createdist" command for the version of Python you want to use
Run the createvenv command and specify your version and a name for the environment
Run the pip command to install googleads module to the virtual environment
Now when you want to use the virtual environment all you need do is execute a function from the activation.py script at the top of your script and Splunk will run your script using the virtual environment.