Google Structured Data - Parsing error: Missing '}' or object member name

Question

When I used Googles Rich Results page tester I keep running into an issue after injecting PHP into the javascript+td.

I am having a repeated error Parsing error: Missing '}' or object member name

<?php 
  $name = ucwords(strtolower($row['name']));
  $city = ucwords(strtolower($row["city"]));
  $state = $row["state"];
  $profile_page_schema .= "
  {
        \"@type\": \"Person\",
        \"name\": \"$name\",
        \"jobTitle\": \"Insurance Agent\",
        \"image\": \"https://<hidden>.com/assets/images/avatar.jpg\",
        \"url\": \"https://<hidden>.com/pros/reviewinsurance.php?id=$id\",
        \"worksFor\": {
              \"@type\": \"Organization\",
              \"name\": \"$name\",
              \"url\": \"https://<hidden>.com/p/reviewinsurance.php?id=$id\",
              \"address\": {
                    \"@type\": \"PostalAddress\",
                    \"addressLocality\": \"$city\",
                    \"addressRegion\": \"$state\",
                    \"addressCountry\": \"USA\",
              }
            }
    ";
    $profile_page_schema = substr_replace($profile_page_schema ,"", -2);

    echo
    '<script type="application/ld+json">
        {
            "@context": "https://schema.org",
            "@type": "ProfilePage",
                "mainEntity": ['.$profile_page_schema.']
        }
    </script>';
    
    ?>

Here is the rendered markup:

    <!-- Google Structred Data -->
<script type="application/ld+json">
        {
            "@context": "https://schema.org",
            "@type": "ProfilePage",
                "mainEntity": [
  {
        "@type": "Person",
        "name": "Kyle Riley Adams",
        "jobTitle": "Insurance Agent",
        "image": "https://<hidden>.com/assets/images/avatar.jpg",
        "url": "https://<hidden>.com/pros/reviewinsurance.php?id=3549704",
        "worksFor": {
              "@type": "Organization",
              "name": "Kyle Riley Adams",
              "url": "https://<hidden>.com/pros/reviewinsurance.php?id=3549704",
              "address": {
                    "@type": "PostalAddress",
                    "addressLocality": "Reno",
                    "addressRegion": "NV",
                    "addressCountry": "USA",
              }
            }
  ]
        }
    </script>   

You can use the tool here https://search.google.com/test/rich-results