/**
 * How to add notification tags for your custom fields
 *
 * @param array $data
 * @param \GeminiLabs\SiteReviews\Modules\Email $email
 * @return array
 */
add_filter('site-reviews/email/compose', function ($data, $email) {
    $review = glsr_get($email, 'data.review');
    if ($review) {
        $data['template-tags']['custom_telephone'] = $review->custom->telephone;
        $data['template-tags']['custom_state_county'] = $review->custom->state_county;
    }
    return $data;
}, 10, 2);