Help AI Search on Custom portals

Hello, We are currently working on adapting AI search on my company, an old teammate who left, was in charge of a proof of concept to start using this technology, so he set all of this up on out of the box SNOW portals, like employee center and knowledge portal, and it works very well (dev instance), the issue now is, he left and I am new to this and my task is to do this same work, but on our custom portal, all of the company's work is made on a custom portal, built form scratch, so I need to know if it is even possible to do this on a custom portal (full of widgets), if it acts the same as in out of the box portals, and how I can configure it. Thank you very much