I think the goal here is to have an out of the box "self-hosted Twitch" experience.

Spin up their Docker container, connect it to a storage provider, and you're good to go.

Jitsi and Nextcloud are video conferencing solutions if I'm not mistaken, this is livestreaming.. A bit of a different model, where only the broadcaster is sending out video, and everyone else is just watching and maybe using the (text-based) chat room.