Is there a way to set externalLabels or commonAnnotations in grafana unified_alerting?

I want to be able to set an annotation on an alert. Say I want to set an annotation on all alerts firing from grafana to have an annotation “origin”:“grafana”. This would be really nice to be able to set in a config and apply to all alerts so users don’t need to remember to set it. Usually this can be done in a prometheus config as an externalLabel or a commonAnnotation I believe but since this is all embedded Alertmanager I’m not sure where the config would even be to do this?

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I am not familiar with grafana. When I try to use Grafana8.4 unified alerting, I also have this question. I want all alerts to have external labels (like cloudcluster
Expect for someone to give good advice for this question.