How to plug in an external website for VF to use

Hello, I've had a play with OpenAI in making a chatbot for a car sales service. One of the options you could choose is the get a valuation for your car to trade-in. I defined what website it uses (https://www.redbook.com.au/) in the system prompt. OpenAI takes this URL and asks the user for relevant information to feed into and spits out a valuation number.

I'm trying to replicate this in VF, so I can setup car recommendations with cards. Problem is when I do the same thing with a prompt, it only tells the user to go to the website. Is there a way I can build this out?

Thanks for any help