custom connector

I'm working on creating a custom connector for a secured API which is on on-prem. I used the postman collection and there are 3 requests. First one is to get the AUTH token, and the other two requests are operation specific. The AUTH token request is executed first to get the token and then I have to use that token in authorization header in the operation specific requests.

When creating a custom connector using the Postman exported JSON, I get all the three operations in custom connector but how do I use the response one the AUTH request to get the AUTH token and apply it in the other requests. Is it possible to do so in a single connector? All the examples I see are of unauthenticated APIs so I'm seeking for advice if anyone has tackled this situation successfully. Thank you!