Editing code card

I setup the default sample site then exported the content.
The Welcome page which introduces the visual editor has a code card containing:

[
      "code",
      {
        "code": "<header class=\"site-header outer\">\n    <div class=\"inner\">\n        {{> \"site-nav\"}}\n    </div>\n</header>"
      }
]

I don’t understand how the editor creates or updates this content. Is this a hidden feature?
I need the identical thing for my content, but can’t figure out if it’s possible.
Thanks
Andy

Arg never mind. Figured it out.

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