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They have a built in javascript engine, select "Auto" and then in the bottom right there is a dropdown that you can set to custom. See highlighted red rectangle in screen shot.

Ok, i see.
I was thinking about a bot looking as well at some stats of previous rounds + the participants of the round (you exit ony when first bonus is there, size of the bonus based on previous round, etc).

you can make your bot track all of those things while it plays and put it in local storage. that is what mine did.