Are 'LearningTrail.xml' files allowed in the Swift Student Challenge submission?

I noticed that some of the built-in playgrounds have a file called LearningTrail.xml, with contents that look like this:

Code Block <?xml version="1.0" encoding="UTF-8"?><trail version="1.1" name="0103">  <steps>    <step type="context">      <blocks>        <block type="title">          <title id="MfZ-Gx-dNg">What’s An Action?</title>        </block>        <block type="image" source="content-whats-an-action" height="0.75">          <description id="AcK-pe-jkX">A snail with four circles above it, showing the snail can scale, move forward and back, rotate, and fade in and out.</description>        </block>        <block type="text">          <text id="jYg-QZ-KMx">In addition to animations, you can also scale, move, rotate, and fade your models using actions.</text>        </block>                <block type="buttons" alignment="trailing">          <button href="@nextStep" symbol="arrow.right.circle.fill">            <text id="BMD-jU-Xiz">Ready?</text>          </button>        </block>      </blocks>    </step>... lots more

The result looks like this: image link

I can't find any documentation on this... will this be considered a private API? Are we allowed to make our own LearningTrail for our Swift Student Challenge submission?