public function getClientsAndContentTypesAsChoices(): array
    {
        $clientsAndContentTypes = [];

        foreach ($this->clientsConfig as $clientName => $clientConfig) {
            /** @var \Contentful\Delivery\Client $client */
            $client = $clientConfig['service'];

            $clientsAndContentTypes[$client->getSpace()->getName()] = $clientName;
            foreach ($client->getContentTypes()->getItems() as $contentType) {
                /* @var \Contentful\Delivery\Resource\ContentType $contentType */
                $clientsAndContentTypes['>  ' . $contentType->getName()] = $clientName . '|' . $contentType->getId();
            }
        }

        return $clientsAndContentTypes;
    }