Is it possible to return `argparser` for customization?

`fire` can complete ~90% of the CLI needs for my application. However, the help documentation is only available during runtime in my case. Is there some way of getting access to the `argparse` parser from Fire and modifying it as a user? It looks like the overload-able information is available up to this point:

https://github.com/google/python-fire/blob/ed44d8b801fc24e40729abef11b2dcbf6588d361/fire/core.py#L129

After which it disappears into the void. I would love to be able to modify this parser by adding runtime information. Bonus points if after doing so, I can give it back to `fire` to call the component trace, etc. 🙂