HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .height callback</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    .bar {
      width: 40px;
      background: #7c3aed;
      margin: 4px;
      display: inline-block;
      vertical-align: bottom;
    }
    button { margin-top: 12px; padding: 8px 14px; cursor: pointer; }
  </style>
</head>
<body>
  <div id="chart">
    <div class="bar"></div>
    <div class="bar"></div>
    <div class="bar"></div>
    <div class="bar"></div>
    <div class="bar"></div>
  </div>
  <button type="button" id="apply">Apply index-based heights</button>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#apply").on("click", function() {
      $(".bar").height(function(index) {
        return 30 + index * 25;
      });
    });
  </script>
</body>
</html>

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jQuery .height(function) — per-index heights (Try It)