Enabling Google Annotations can offer some lift in engagement, particularly if a significant portion of your audience—like your 63% Gmail users—are on Gmail and receive promotional emails in the Promotions tab. Google Annotations allow you to visually enhance your emails with images, deals, expiration dates, and other rich snippets that appear directly in the inbox preview, potentially increasing visibility and click-through rates. That said, results can vary. Some marketers have reported moderate improvements in open and click-through rates—typically in the range of 5–15%—while others have seen minimal impact, depending on how compelling and relevant their annotation content is.