As you might have noticed, PeerTube has a plugin for chatting during livestreams (screenshot below). It's really nice!
If you do livestreaming on PeerTube, ask your server admin if the plugin can be added, it makes livestreams a lot more fun. There is more info about the plugin at https://github.com/JohnXLivingston/peertube-plugin-livechat
The creator of the plugin is @John_Livingston and they have a roadmap of more features they want to add to the plugin. You can help make this happen by donating to Livingston's LiberaPay account at https://liberapay.com/JohnLivingston