It is possible for sure. You can ask ChatGPT to do that.

What might happen is that when you ask ChatGPT more complex indicators/strategies, it might have errors but then you ask it to fix the error.

Also check this article: https://medium.com/datadriveninvestor/use-chatgpt-to-create-a-profitable-trading-bot-in-just-a-few-minutes-f153cf51ee3c