protected function serveRawAssets(Collection $collection, string $group, ?string $format) : array {
        $responses = array();

        foreach ($collection->getAssetsOnlyRaw($group) as $asset) {
            $path = $asset->getRelativePath();

            $responses[] = $this->{'create'.studly_case($group).'Element'}($path, $format);
        }

        return $responses;
    }