How to automatically set OAuth 2.0 Access Token as variable

I get a management screen showing previous tokens, Click Use token

Postman showing “Token added”… to the tab as per my understanding.

Now the tricky part. In this tab, I also have the Pre-request Script defined, to set the global variable before request…

… I Send a request, which actually don´t matter.
What matters is, that the script does write the token from the request, to my global variable.

continue in next post…