Is there a way I can add okta auth to a single api endpoint in my express app

I have a node express backend and angular 5 frontend app where I am using Okta authentication.

Now in that app I have a route which is only for the admins and currently accessed hitting the url in the browser. Without authentication this route is not secure and I would like to use okta sdks and config that i am already using with my existing application. How do I configure this in okta dashboard so that only users assigned to the admin group is authenticated to this application route.

Please point me to relevant docs.