What to set for the variables in Gitlab CICD settings

I am referring to the guide here what should I setup in Gitlab CICD settings?

NEXUS_CONTAINER_SCANNING_SCANNER_IMAGE ← is this the image Just build in the same gitlab CI pipeline?

NEXUS_CONTAINER_SCANNING_REGISTRY_URL ← please give example

NEXUS_CONTAINER_SCANNING_REGISTRY_USER ← sonatype lifecycle login user? or gitlab login user?

NEXUS_CONTAINER_SCANNING_REGISTRY_PASSWORD ← sonatype lifecycle login user? or gitlab login user?

NEXUS_CONTAINER_SCANNING_LICENSE ← we have license installed in sonatype lifecycle, what is this? please give example.