chromium/components/policy/resources/templates/policy_definitions/Extensions/policy_atomic_groups.yaml

Extensions:
  caption: Extensions
  policies:
  - ExtensionInstallAllowlist
  - ExtensionInstallBlocklist
  - ExtensionInstallForcelist
  - ExtensionInstallSources
  - ExtensionAllowedTypes
  - ExtensionAllowInsecureUpdates
  - ExtensionSettings
  - ExtensionManifestV2Availability
  - ExtensionUnpublishedAvailability
  - ExtensionExtendedBackgroundLifetimeForPortConnectionsToUrls