Change block on export

i want change my view but not on export

for sample i added this code

blockManager.add('products', {
  label: 'products',
  content: '
  <ul>
    {% for product in products %}
      <li>{{ product.name }}</li>
    {% endfor %}
  </ul>
',
});

and now i want show this code on view

blockManager.add('products', {
  label: 'products',
  content: '
  <ul>
      <li>car</li> <!-- fake data for show on view -->
      <li>train</li> <!-- fake data for show on view -->
  </ul>
',
});

how can i take this action ?