I mean it's a simple fact that the baseline for creating a game, roughly using the average developer experience/capability, is not months. Making a _good_ game might take months, it often takes years.
And that's the part AI is not going to be able to help you with.
Making a good boardgame, with zero need for programming, excluding artwork, is months or years of work. I would expect that much at a minimum for a (good) simple digital game, unless it is just going to sell on graphics and marketing alone (or luck).
Maybe you are a games developer and are overlooking the fact that people have to first learn the basic apis/models/etc. of graphical systems, engines, etc. before using them. Not sure how you are saying that it wouldn't take a few weeks to code even a simple production game like chess or more complicated but still simple Jump king etc.
Just think of the speciality in which you aren't an expert, javascript/storage/networking ...
You're contradicting yourself. I promise it wouldn't take you months, unless you're just a really bad developer.