I don't think there is one but you can write a plugin using the hook filter:router.page. This hook gets called before the actual topic route handler.
In your plugin you can just do this:
myPlugin.filterRouterPage = function (req, res, next) {
const myAnnouncementTopicId = 111;
if (req.params && req.params.topic_id && parseInt(req.params.topic_id, 10) === myAnnouncementTopicId) {
req.query.sort = 'newest_to_oldest';
}
next();
};
