AEM 6.3 : CQ Annotations Write Operation Failed on Read Only Pages

In our use case,

Authors Group- Have create/write/modify access to content pages.

Reviewers Group- Doesn't have create/write/modify access to content pages . Only read access given as they are restricted to change any authoring content.

A reviewer can only add comments using annotation on an already authored page.

Since annotations are stored under component / page node (jcr:content/cq:annotations) in the repository ,

In Annotation Mode, Write Operation fails as CQ:Page is not given write/modify access for Reviewers Group.

Reviewers not able to annotate.

Is there any solution? Can we store the annotations in a different content structure and still able to refer in a page.

Thanks.