Just went into a stream of a deaf girl who had live CC on by using an extension. Twitch should consider making this a feature of the site imo. By researching a bit I found this link -> https://help.twitch.tv/s/article/guide-to-closed-captions?language=en_US .
This is extremely hard even for a technologically competent person to understand, if it is even a live feature.

Please consider making this a feature of the site available to all creators easily. :)