[Python] In Python I can't "import supervision as sv"

I'm trying to use my new Sony IMX500 camera to count objects in Python with my Raspberry Pi 5.

In the sample code I have, it gets stuck at "import supervision as sv"

I get the error "ModuleNotFoundError: No module named 'supervision'".

I have a folder named /home/wgw1/venv_supervision

I also tried creating a virtual environment (venv) but maybe I did it wrong?

I can get the Sony IMX500 camera working (with some object recognition) at a command prompt, now I want to take it to the next level with python code.

So, here's my python code - it's a simple 4 lines and then it dies:

from picamera2 import Picamera2

import json
import cv2

import supervision as sv

ModuleNotFoundError: No module named 'supervision'

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