Accessing credentials when using `boundary connect --exec`

Hello there!

I have a use-case where I need to run a python script which interacts with a postgres database. That database requires an open connection via boundary.

I’ve gathered that I can execute arbitrary commands using boundary connect --exec python3 myscript.py however I am not sure the best method to ensure the retrieved credentials (database username/password) are accessible by my python script.

I saw certain connection details are available using this style of string replacement {{boundary.addr}} but it is limited to just a few non-credential pieces of information.

Is there an expected way to feed credentials into an arbitrary script or CLI tool?

Thanks!