The Signature Manager tool enables Admins (or appointed users) to view, edit, and save Gmail™ signatures for users in your organization. The tool allows management of your selected, global company design to all users or select users, groups, or Organizational Units (OUs). 

Maintain professionalism and branding consistency in your Google Workspace™ mail environment with HiView Signature Management, developed by a Google Cloud Premier Partner.

This product is either free with limited functionality or available on a yearly paid subscription which allows admins to appoint additional users to manage signatures and ensure users are supported.  The product will continue to implement new feature requests and enhancements.