I had difficulties to install brew on WSL, so I scraped for a workaround.
Take this with a grain of salt because nothing works for me yet but...
If I understood it right, seems like the need to use brew could be eliminated if the 'dotenv' command invocation were replaced by loading environment inside the python code. (Or is there a reason that won't work?)
from dotenv import load_dotenv
# Load environment variables from .env file
load_dotenv()