Chat box in a test environment / for capture

[Dist]

There’s no way to do this through the chat system itself, but as the chat window is HTML one option that would be entirely client-side would be to write a script that manipulates the DOM and creates elements with whatever text you like.

One important thing to keep in mind though is that Twitch’s legal guidelines on use of emotes for things including ‘creative works’ which your short film would fall under:

Without express permission, we do not allow use of emotes. Twitch and/or third parties own rights such as copyrights, trademarks, and/or rights of publicity in emotes on Twitch. Please note that in addition to us, the use of an emote may require permission from such third parties.

https://www.twitch.tv/p/en-gb/legal/trademark/

So without explicit permission from Twitch (or individual channels if you want to use channel emotes), you should not use emotes.