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

PrivacySandbox:
  caption: Privacy sandbox settings controls
  policies:
  - PrivacySandboxPromptEnabled
  - PrivacySandboxAdTopicsEnabled
  - PrivacySandboxSiteEnabledAdsEnabled
  - PrivacySandboxAdMeasurementEnabled