This task can be performed using BulkSignature
BulkSignature is a powerful email signature management solution for businesses of different size
Best product for this task

BulkSignature
marketing
BulkSignature is an advanced email signature management solution for Google Workspace. It enables business to automate signature deployment, ensure brand consistency, and simplify updates with a user-friendly HTML editor, bulk user management, and campaign banners. Designed for IT teams and businesses, BulkSignature reduces manual work, enhances corporate communication, and provides seamless integration for effortless signature management across the entire organization.

What to expect from an ideal product
- Upload a new signature template once and automatically apply it to all employees' accounts
- Change marketing banners and campaign images across all signatures from a single dashboard
- Update contact details, social media links, and disclaimers for the entire company at once
- Roll out seasonal promotions and special offers to all email signatures with a few clicks
- Sync employee information from Google Workspace to automatically fill signature fields without manual input