Laravel Zero: How to configure Storage to use local disk with getcwd() as root?

I am trying to build an CLI App with the help of Laravel Zero.
I can globally call the "executable" (Artisan) of my app. I need to work with the files on the current working directory.

Now I want to use the Storage Facade / FileSystem.

How do I configure Laravel Zero so that I can add a custom disk like:

Storage::disk('cwd')->files(....);

I tried to use the config file "app.php" inside the config dir. (Since there are no other config files...)

'filesystems' => [
    'default' => [
        'driver' => 'local',
        'root' => getcwd()
    ]
],

or

'filesystem' => [
    'disks' => [
        'cwd' => [
            'driver' => 'local',
            'root' => getcwd(),
        ],
    ],
    'default' => [
        'driver' => 'local',
        'root' => getcwd()
    ]
],

When I run the executable from a directory which I want to use as my "root", I get an

InvalidArgumentException  : Driver [] is not supported.

My enviroment: Windows 10 with PHP7.2

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