Can I send prometheus alerts to Grafana 8?

If I understand correctly, Grafana 8 now has a built-in version of alertmanager. Is it possible then to send prometheus alerts (i.e. alerts defined in Prometheus rule files) directly to Grafana? I can’t seem to find the correct config for that.

I tried something like this but it doesn’t seem to work:

    - static_configs:
      - targets:
        - grafana:3000