Yes. Go to the Custom Stream Knowledge section of your account page.
Everything here is optional. Add as much or as little as you want about anything Joe would not understand from watching today’s stream alone. This can include background longtime viewers already know, or corrections to anything he may misunderstand about you, your stream, or what is happening. Short, clear notes work best.
Add useful context about you and what viewers can see, such as your age, gender, appearance, costume or recurring visual bits, pets, or room setup, along with channel-specific context Joe cannot simply infer: famous past moments, recurring jokes, catchphrases, community memes, streamer habits, nicknames, milestones, and references that need an explanation. Say what they mean and how chat uses them so Joe can recognize the joke rather than miss it.
You can also lightly guide how Joe speaks. He already has his own personality, but you can ask him to be more dry, warm, sarcastic, relaxed, direct, or closer to your channel’s usual energy.
For games, add context Joe could not easily figure out on his own: special rules, advanced strategies, mods, builds, loadouts, server history, challenge rules, squad habits, unusual goals, or long-running storylines. Popular games may need only a few notes; niche games may need more.
Finally, clearly state anything Joe should not say, joke about, reference, imitate, or bring up. Direct rules such as “Do NOT discuss…” work best.