Passing c.Spawner.Args with Sudospawner

Hi, my jupyterhub is using sudospawner.

I wish so set c.Spawner.args = ['--JupyterApp.config_file=/etc/jupyter/'], so when Notebook app launches for each user it uses that config.

In that configuration I am adding post_save_hook.

However, the variable c.Spawner.args is not working with sudospawner, I have read that it uses jupyterhub-singleuser for that. However, I have read that jupyter notebook for loading that file you just need to create under /etc/jupyter. I have tried it without success