Gmail promotion annotations are a way to add additional information to emails that are sent to the Gmail Promotions tab. This information can include things like deal badges, expiration dates, and promo codes. When you annotate an email, Gmail users can see this information directly from the Promotions tab, without having to open the email.
There are two ways to create Gmail promotion annotations:
- Use JSON-LD:JSON-LD is a lightweight markup language that can be used to add structured data to web pages and emails.
- Use Microdata:
Microdata is another lightweight markup language that can be used to add structured data to web pages and emails.