How to use Oauth2 Introspection Endpoint

I’m trying to use Kong’s OAuth 2.0 Introspection plugin and all I want to do is to create an example. I don’t really understand how this gets to be configured and so I figured out to try and do that with Okta. But I can’t find any example that clearly outlines how to do this? I have basically an Authentication and an Introspection URL fields that I need to fill in in Kong Konnect. But I’m not sure how would that work if I for example would use the Okta Dev environment to create my Demo App.