Any experience with Google Quick Action buttons for system emails?

Hello-

We'd like for our ShipmentSent.CustomerNotification messages to include the schema.org code to make the "Track Package" button appear in the Subject line of the emails.

I found the documentation at Google, and it seems simple:
https://developers.google.com/gmail/markup/reference/go-to-action#track_action

I wonder if anyone has tried to do this yet??

Maybe like this?

<div itemscope itemtype="http://schema.org/ParcelDelivery">
  <link itemprop="trackingUrl" href="http://fedex.com/track/%Shipment.TrackingNumber%"/>
  <div itemprop="potentialAction" itemscope itemtype="http://schema.org/TrackAction">
    <link itemprop="target" href="http://fedex.com/track/%Shipment.TrackingNumber%"/>
  </div>
</div>

Or maybe this?

<div itemscope itemtype="http://schema.org/ParcelDelivery">
  <link itemprop="trackingUrl" href="%Shipment.URLForCustomer%"/>
  <div itemprop="potentialAction" itemscope itemtype="http://schema.org/TrackAction">
    <link itemprop="target" href="%Shipment.URLForCustomer%"/>
  </div>
</div>

Please share your experience if you have any-
Thanks!