nshop/packages/Webkul/Shipping/src/Config/system.php

<?php

return [
    [
        'key'    => 'sales.carriers.zonerate',
        'name'   => 'admin::app.configuration.index.sales.shipping-methods.zone-rate.page-title',
        'info'   => 'admin::app.configuration.index.sales.shipping-methods.zone-rate.title-info',
        'sort'   => 3,
        'fields' => [
            [
                'name'          => 'title',
                'title'         => 'admin::app.configuration.index.sales.shipping-methods.zone-rate.title',
                'type'          => 'text',
                'depends'       => 'active:1',
                'validation'    => 'required_if:active,1',
                'channel_based' => true,
                'locale_based'  => true,
            ], [
                'name'          => 'description',
                'title'         => 'admin::app.configuration.index.sales.shipping-methods.zone-rate.description',
                'type'          => 'textarea',
                'channel_based' => true,
                'locale_based'  => true,
            ],             [
                'name'          => 'allowed_countries',
                'title'         => 'admin::app.configuration.index.sales.shipping-methods.zone-rate.allowed-countries',
                'type'          => 'multiselect',
                'options'       => 'Webkul\Shipping\Carriers\ZoneRate@getCountryOptions',
                'channel_based' => true,
                'locale_based'  => false,
            ], [
                'name'          => 'active',
                'title'         => 'admin::app.configuration.index.sales.shipping-methods.zone-rate.status',
                'type'          => 'boolean',
                'channel_based' => true,
                'locale_based'  => false,
            ],
        ],
    ],
];