Single-user image runtime flags?

In config.yaml is it possible to specify equivalent docker run flags when specifying a custom single user image?

In my particular case, I am trying to use the rapidsai/rapidsai as the single user image but would like to set some environment variables that are documented during the docker run step.

Z2JH runs containers on Kubernetes which is similar but not the same as Docker. Most configuration has an equivalent though. For environment variables you can set singleuser.extraEnv.