Computer Configuration > Administrative Templates > Google Chrome
Both
HKLM\Software\Policies\Google\Chrome
Lens Overlay lets users perform contextual Google searches either via a screenshot or by asking a question about the current page's contents. This feature requires the end user to opt-in. This feature is available to all users with Google as their default search engine, unless it is disabled by this policy. When policy is set to 0 - Allow or not set, the feature will be available to users. When policy is set to 1 - Do not allow, the feature will not be available. Starting in Google Chrome 140, if the policy is unset, its behavior is determined by the GenAiDefaultSettings policy.