services.grafana.declarativePlugins

If non-null, then a list of packages containing Grafana plugins to install. If set, plugins cannot be manually installed.

Keep in mind that this overrides any app that Grafana might preinstall. This affects for instance Grafana Drilldown (grafana-metricsdrilldown-app, grafana-lokiexplore-app, grafana-exploretraces-app and grafana-pyroscope-app), but also data-sources like prometheus, loki, tempo and jaeger.