Mark's Locksmith

<div itemscope itemtype="http://schema.org/LocalBusiness">
  <h2 >Example Business Name</h2>
  <div  >
    <span >4.5</span> stars - based on
    <span itemprop="reviewCount">100</span> reviews
  </div>
  <div itemprop="review" itemscope itemtype="http://schema.org/Review">
    <div >John Doe</div>
    <div itemprop="reviewRating" itemscope itemtype="http://schema.org/Rating">
      <span >5</span>
    </div>
    <div itemprop="description">Great experience! The service was fast and the staff was friendly.</div>
    <meta  content="2022-03-15">
  </div>
  <!-- Add additional review elements as needed -->
</div>

In this example, we use the LocalBusiness schema type to define the business being reviewed, and the AggregateRating and Review schema types to provide information about the review itself.

The aggregateRating property provides the overall rating and review count for the business, while the review property provides the details of an individual review, including the author, rating, and description.

Note that this is just an example, and the specific schema markup you use may vary depending on your needs and the specific requirements of your website. Also, be sure to test your structured data using Google's Structured Data Testing Tool to ensure that it is valid and properly formatted.

You can test it here:
https://search.google.com/test/rich-results