You can create a Python virtual environment and have the needed packages placed there. You can have the packages installed into the Python interpreter available systemwide.

Take control of multiple Python installations in Windows with the py launcher, available as part of a standard Python installation.

First of all, I prefer to create a virtual environment by running python3 -m venv .env, and then installing the Streamlit package by running pip3 install streamlit. Now create a Python script.