Ktor + keycloak

Any advice how to secure ktor with keycloak?

My setup is like this:
Vue application uses keycloak to login - works great btw.
The Vue-App gets an access token and sends this token via header to the rest server (ktor) but what’s the next step? I am not sure hot to verify the security id the comes with the jwt…

I found this post because I have the same question. Any news on Ktor + Keycloak?