Hello!
Generally, extensions are normally not something you submit feature requests for.
Feature requests are for the main engine itself, whereas extensions are usually made by community members.
I have tested with ChatGPT and it (generally) gives incorrect answers for GDevelop processes itself, so it is unlikely something that would be implemented in the main engine. The ChatGPT API is also not free, and has a cost per call after the first $18 worth of calls.
However, if you would like to build out your own connections with ChatGPT, you are welcome and able to. The Network “send a request” actions in the engine (Network [GDevelop wiki]) work with REST APIs, or you can build out your own connection to the javascript API using the Javascript events in the engine.
As this doesn’t fit for a full feature request, I’m going to go ahead and close out this thread, but I hope the above guidance gives you direction.