if ( file_exists( WP_CONTENT_DIR . '/a8c-plugins/happy-blocks/index.php' ) ) {
require_once WP_CONTENT_DIR . '/a8c-plugins/happy-blocks/index.php';
}
$settings['iso']['blocks']['allowBlocks'][] = 'happy-blocks/support-page';
$settings['iso']['blocks']['allowBlocks'][] = 'happy-blocks/forum-topic';
Note, that only public forums topics could be embedded.