What is the correct way to embed schema.org markup in an email so that gmail can see it?

Question

gmail

I want to add schema.org markup to the email for several purposes:
- displaying the subscription confirmation button in the email subject
- displaying order information in googlenow
When generating markup using https://www.google.com/webmasters/markup-helper/ nothing happens it turns out that gmail does not see the markup, or it sees, but nothing happens.
After generating the markup through markup-helper and then checking it here https://www.google.com/webmasters/markup-tester/ , a lot of errors pop up and it's not entirely clear how to fix them.
Tried to find a thread that explains how to embed markup in emails, but couldn't find anything.

Answer 1

Just doing everything right is not enough for Google (and for other mailers as well). You need to build a reputation as a quality sender for some features that are not currently available to work. make high-quality legal mailings, and soon the additional unsubscribe/subscribe buttons you need and other pluses that are now available only for trusted senders such as fb, for example, will begin to appear in topics. Nothing else.