How to render same element multiple times in AMP?

Suppose I have the following json about the user reviews:

  "reviewRating": 4,
  "comment": "this is great"

Then I use amp-list to loop through the reviews.

<amp-list items="." single-item>
  <template type="amp/mustache">
    <!-- How can I render 4 star images here? -->
    <span>Rating: {{reviewRating}}</span>

For the reviewRating, I want to render the same number of stars from reviewRating key/value to make a better look and feel. How can I do this in AMP?