how to change the title that shows in parcel delivery type of gmail markup highlights? - google-schemas

Question

Hi I'm trying to send emails with gmail markup. The markup type I am using is Parcel delivery. Everything went well with the sample code. But it confused me when I am trying to change the title part of the highlights. The title part seems always showing whatever in "Items" like the screenshot below.
Markup code I am using.
<div itemscope itemtype="http://schema.org/ParcelDelivery">
<div itemprop="deliveryAddress" itemscope itemtype="http://schema.org/PostalAddress">
<meta itemprop="name" content="John Frank"/>
<meta itemprop="streetAddress" content="24 Willie Mays Plaza"/>
<meta itemprop="addressLocality" content="San Francisco"/>
<meta itemprop="addressRegion" content="CA"/>
<meta itemprop="addressCountry" content="US"/>
<meta itemprop="postalCode" content="94107"/>
</div>
<div itemprop="originAddress" itemscope itemtype="http://schema.org/PostalAddress">
<meta itemprop="name" content="John Frank"/>
<meta itemprop="streetAddress" content="25 Willie Mays Plaza"/>
<meta itemprop="addressLocality" content="San Francisco"/>
<meta itemprop="addressRegion" content="CA"/>
<meta itemprop="addressCountry" content="US"/>
<meta itemprop="postalCode" content="94107"/>
</div>
<meta itemprop="expectedArrivalFrom" content="2027-03-10T12:00:00-08:00"/>
<meta itemprop="expectedArrivalUntil" content="2027-03-12T12:00:00-08:00"/>
<div itemprop="carrier" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="FedEx"/>
<link itemprop="url" href="http://fedex.com/"/>
</div>
<div itemprop="itemShipped" itemscope itemtype="http://schema.org/Product">
<meta itemprop="name" content="Item Shipped.Name"/>
<link itemprop="url" href="http://apple.com/ipad32gb"/>
<link itemprop="image" href="http://apple.com/images/ipad32gb.jpg"/>
<meta itemprop="sku" content="B00DR0PDNE"/>
<meta itemprop="description" content="iPod Mini 32Gb White"/>
<div itemprop="brand" itemscope itemtype="http://schema.org/Brand">
<meta itemprop="name" content="Apple"/>
</div>
<meta itemprop="color" content="white"/>
</div>
<meta itemprop="trackingNumber" content="3453291231"/>
<link itemprop="trackingUrl" href="http://fedex.com/track/3453291231"/>
<div itemprop="potentialAction" itemscope itemtype="http://schema.org/TrackAction">
<link itemprop="url" href="http://fedex.com/track/3453291231"/>
</div>
<div itemprop="hasDeliveryMethod" itemscope itemtype="http://schema.org/ParcelService">
<meta itemprop="name" content="http://schema.org/ParcelService"/>
</div>
<div itemprop="partOfOrder" itemscope itemtype="http://schema.org/Order">
<meta itemprop="orderNumber" content="176057"/>
<div itemprop="merchant" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="Merchant Name"/>
<link itemprop="sameAs" href="http://www.freebase.com/m/0fhkx"/>
</div>
<link itemprop="orderStatus" href="http://schema.org/OrderInTransit"/>
</div>
</div>
Current highlights screenshot:
When I trying to have the title part of highlights show as the UPS notification email in attached, which is different from what's in "Items", I don't know where to change. I've read through the parcel delivery reference here but didn't find anything about it. I know where to change the "Items", "expected delivery date", "Merchant name" in highlights, but I can't find how to change the content of the title like the circled part like in UPS email. Please help. Many thanks!
UPS email screenshot: