{{ strtoupper(__('app.url')) }} {!! Form::text('config[override_url]', null, array('placeholder' => __('app.apps.override'), 'id' => 'override_url', 'class' => 'form-control')) !!}

Stats to show {!! Form::select('config[availablestats][]', App\SupportedApps\ShellyPlug\ShellyPlug::getAvailableStats(), isset($item) ? $item->getConfig()->availablestats ?? null : null, ['multiple' => 'multiple']) !!}

Test