How can I use data from the raw model in a template?

[ChrisKulesza]

I have added the value subTitle to the globalMetadata. When I export the rawModel, the subTitle is in the json. For some unknown reason I can't access this value in the cover template using mustache syntax.

I would like to define a value in the docFx configuration that can then be accessed in the cover template.

docfx.json

"globalMetadata": {
      "_appName": "App name",
      "_appTitle": "App title",
      "_appLogoPath": "images/logo.svg",
      "_appFaviconPath": "images/favicon.ico",
      "_enableNewTab": true,
      "_enableSearch": true,
      "_disableBreadcrumb": true,
      "pdf": false,
      "_gitContribute": {
        "repo": "repoLink",
        "branch": "develop"
      },
      "subTitle": "Subtitle"
    }

cover.html.primary.tmpl

{{!Copyright (c) Microsoft. All rights reserved. Licensed under the MIT license. See LICENSE file in the project root for full license information.}}
{{!master(layout/_master.tmpl)}}
<style>
.cover-title {
    height: 200px;
    width: 400px;
    position: fixed;
    text-align: center;
    top: 50%;
    left: 50%;
    margin-top: -100px;
    margin-left: -200px;
}

.cover-subTitle {
    top: 55%;
}
</style>

<div class="cover-title">{{{rawTitle}}}</div>
<div class="cover-title cover-subTitle">{{subTitle}}</div>

{{{conceptual}}}

cover.md

---
documentType: cover
---
# Title
## User Manual

index.raw.json

{
  "subTitle": "Subtitle"
}