Currently we have only descheduler.alpha.kubernetes.io/evict annotation but please notice that the descheduler is only checking the presence of the annotation key, not its value so, counterintuitively descheduler.alpha.kubernetes.io/evict: "true" and descheduler.alpha.kubernetes.io/evict: "false" are actually producing the same effects.
See also https://github.com/kubernetes-sigs/descheduler/pull/1673 for a possible improovement.

The CNV UI is already exposing a knob to let the VM owner set descheduler.alpha.kubernetes.io/evict: "true" annotation on the VM but please notice that KubeVirt controller is not propagating VM annotation to pod ones and this requires a restart of the VM or a live migration.