You can use the "{{% livechat_label share_chat_link %}}" feature to generate an URL to your chat.This button should be near the chat if you are the video owner (unless it was desactivated by your server admins).
You can use the "{{% livechat_label transparent_background %}}" option to have a transparent background in OBS.If you want to customize the background transparency, you can add this CSS in your OBS browser source's settings:
Note: you can entirely customize chat colors. This is undocumented yet, but you can try this: in the modal, check «use curent theme colors», then you can try to manually change color values in the URL.You must use valid CSS color values, and they must be properly URL encoded.
You can use the [social_stream browser extension](https://github.com/steveseguin/social_stream#readme) to mix multiple chat source (from Peertube, Twitch, Youtube, Facebook, ...) and include their contents in your livestream.The compatibility with this plugin was added in recent versions.
In the "plugin settings" tab, there is a "{{% livechat_label use_chat %}}" checkbox.Just check or uncheck it to enable or disable the chat associated to your video.