Yes, in order to use the installed Python ROS package, you need to add the Noetic ROS folder to your Windows environment variable `PYTHONPATH`. This will allow you to import the ROS package when using the `python3.8` command.
To add the Noetic ROS folder to `PYTHONPATH`, follow these steps:
1. Open the start menu and search for "environment variables".
2. Click on "Edit the system environment variables".
3. In the System Properties window, click on the "Environment Variables" button.
4. In the "System variables" section, find the variable named `PYTHONPATH` and click on the "Edit" button.
5. In the "Edit Environment Variable" window, click on the "New" button.
6. Enter the path to your Noetic ROS folder. For example, if the folder is located at `C:\opt\ros\noetic`, then add `C:\opt\ros\noetic\lib\site-packages` to `PYTHONPATH`.
7. Click "OK" to close all windows.
After adding the Noetic ROS folder to `PYTHONPATH`, you should be able to import the ROS package when using the `python3.8` command.