"pip freeze" generates a versioned list of packages to install in the same format as requirements.txt -- in this example below i've called it versions.txt. I have a bash wrapper "bin/venv-create" which essentially does this

    python3 -m venv .venv/
    if [[ -f versions.txt ]] && [[ versions.txt -nt requirements.txt ]]; then
        pip install --requirement versions.txt
    else
        pip install --requirement requirements.txt
        pip freeze > versions.txt
    fi

(I place the files in etc/pip/ in my projects (and check them into git), but I've omitted the paths for clarity. One could embellish this by including python version number in the filename, as package requirements can change between python versions.)

I also have a bin/venv-python wrapper which sets PYTHONPATH, PYTHONDONTWRITEBYTCODE before chain calling .venv/bin/python3 with the arguments, and this is how pip above is called. (again, omitted above for clarity.)

This won't cover everyone's usage scenario, but it works for me. YMMV.

https://iam.georgecox.com/2021/09/25/python-3-venv/ explains the details.