Computer Configuration > Administrative Templates > Google Chrome
Both
HKLM\Software\Policies\Google\Chrome
Setting the policy allows merging of selected policies when they come from different sources, with the same scopes and level. Use the wildcard character '*' to allow merging of all list policies. If a policy is in the list and there's conflict between sources with: * The same scopes and level: The values merge into a new policy list. * Different scopes or level: The policy with the highest priority applies. If a policy isn't in the list and there's conflict between sources, scopes, or level, the policy with the highest priority applies. Example value: ExtensionInstallAllowlist ExtensionInstallBlocklist