public function getSpacesAndContentTypesAsChoices(): array
    {
        $spaces = [];

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

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

        return $spaces;
    }