JSON-LD markup for rich email messages

email-message.js

<script type="application/ld+json">
{
  "@context":"https://schema.org",
  "@type": "EmailMessage",
  "description": "View this Pull Request on GitHub",
  "action": {
    "@type": "ViewAction",
    "url":"https://github.com/perma-id/w3id.org/pull/47",
    "name":"View Pull Request"
  }
}
</script

How to include your organisation / brand as the sender? I've been trying to brand my emails without success (i.e. company name and icon).

I've tried setting multiple props as follows..

                            <script type="application/ld+json">
                            {
                                "@context": "http://schema.org",
                                "@type": "EmailMessage",
                                "description": "Test!",
                                "image": "https://apiant.com/appResources/icons_large/shopify.png",
                                "thumbnailUrl": "https://apiant.com/appResources/icons_large/shopify.png",
                                "sender": {
                                    "@type": "Organization",
                                    "name": "name",
                                    "logo": "https://apiant.com/appResources/icons_large/shopify.png",
                                    "brand":   {
                                        "name": "name"
                                    }
                                }
                            }
                            </script>