[Python] How to specify path to custom python modules when deploying on Vercel

when deploying the project on Vercel, an error occurs:

File "/var/task/api/main.py", line 2, in <module>
from config import app, db
ModuleNotFoundError: No module named 'config'


i have 3 *.py files in my api folder

|api
|-main.py
|-config.py
|-models.py


main.py has imports from config.py and models.py. I added vercel.json from the example

{
"rewrites": [
{ "source": "/(.*)", "destination": "/api/main" }
]
}


But I don't understand how to properly specify the path to my modules so that main.py knows how to get them

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