I don't really understand and i'm new to coding so can I use like ChatGpt or No? That's all if so I might join. And thanks to anyone who can answer my question.

Also is the theme:To be announced. Or is it not revealed yet? 

There's no rule against using AI. But if you use it for a chunk of your game, you should add it to the assets you used for the game.

And the theme will be revealed at the start time of the jam. 👍