JupyterLabで、初期ディレクトリと起動ブラウザを指定するだけのjupyter_lab_config.pyを作るPythonコードです。

import os


def generate_config():
    user = os.environ.get("USER")  # Ubuntuの環境変数
    username = os.environ.get("USERNAME ")  # Windowsの環境変数
    if user:  # Ubuntu
        config_list = [
            "c = get_config()",
            f"c.ServerApp.notebook_dir = '/home/{user}/Documents/'",
            "c.ServerApp.browser = '/usr/bin/google-chrome-stable --args --app=%s --start-maximized'",
        ]

        config_file = f"/home/{user}/.jupyter/jupyter_lab_config.py"

    elif username:  # Windows
        config_list = [
            "c = get_config()",
            f"c.ServerApp.notebook_dir = 'C:/Users/{username}/Documents'",
            "c.ServerApp.browser = '\"C:/Program Files/Google/Chrome/Application/Chrome.exe\" --app=%s --start-maximized'",
        ]

        config_file = f"C:/Users/{username}/.jupyter/jupyter_lab_config.py"

    else:
        return

    with open(config_file, "w") as f:
        f.write("\n".join(config_list))

    with open(config_file, "r") as f:
        print(f.read())

    return


generate_config()