That is correct. There is not a filter that can be added to the topic endpoint to get what you are after. However we do have the
which you could use to write a sql query to get what you are after. You can then save that query and hit the api endpoint for the saved query and pass it a topic_id as a param.
There isn’t a real way to get what you actually want out of this, because the metadata is messy, and people are messy and don’t really care about your analytics too much