ModuleNotFoundError when running a python file in the VS code debugger

I am using VS Code and want to debug a python file. I have a conda env where I installed modules such as numpy, gym etc. If I am running the python file from the terminal everything works fine. Running the VS Code debugger gives me the Error:

Exception has occurred: ModuleNotFoundError No module named 'gym'

From various previous questions, I found that I have to specify the python path in launch.json. So I did and this is my launch.json config:

        {
        "name": "Conda Env jssp",
        "type": "python",
        "request": "launch",
        "program": "${file}",
        "console": "integratedTerminal",
        "justMyCode": true,
        "env": {
            "PYTHONPATH":"${PYTHONPATH}:/Users/paul/miniconda3/envs/jssp/bin/python"    
        } }

Note: my conda env is called "jssp".

What am I missing? Thank you!