Extracting a piece of an idToken from collection-wide PKCE login flow


we have a PKCE login flow implemented in our app. I managed to get it up and running in Postman as the collection-wide Authorization and I’m successfully receiving my access token and id token. But for some specific requests I need to decode one of the tokens and get something from it, which wouldn’t be so hard if I knew how to access that token. With a simple request, I’d just save response to a variable and extract what I need, but I have no idea how to do that for authorization.
I’m talking about this little thing:

What this does, it sends 2 requests one after another (a get and a post), creating all the needed stuff on the way (like the challenge code) - same as with the app, where an external library is used for that purpose. So it’s not your typical single request. And the Test tab is for tests that will run after every single request in the collection, so it’s not really an option.

So, is there a way to save response(s) from this authorization?