HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>table last-of-type</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    table { border-collapse: collapse; }
    td, th { border: 1px solid #cbd5e1; padding: 8px 12px; }
  </style>
</head>
<body>
  <table>
    <tr><th>Name</th><th>Age</th><th>City</th></tr>
    <tr><td>Ada</td><td>28</td><td>London</td></tr>
    <tr><td>Ben</td><td>34</td><td>Paris</td></tr>
  </table>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("tr td:last-of-type").css({
      backgroundColor: "#f1f5f9",
      fontWeight: "bold"
    });
  </script>
</body>
</html>

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Last table column with tr td:last-of-type (Try It)