actuel-inactuel/site/plugins/your-plugin/index.php

<?php

Kirby::plugin('studio-variable/web2print', [
    'fields' => [
        'web2print' => [
            'props' => [
                'options' => function ($options = []) {
                    return $options;
                },
                'value' => function ($value = []) {
                    return $value;
                }
            ],
        ],
    ],
]);