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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .add() — reassign</title>
</head>
<body>
  <p>Hello</p>
  <p id="footer-note">Hello Again</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var collection = $("p");
    collection = collection.add(document.getElementById("footer-note"));
    collection.css("background", "yellow");
  </script>
</body>
</html>

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jQuery .add() — reassign collection (Try It)