How to add a html field to a form in drupal 8 & 9
Code snippet that can be used to add a html field to a form in drupal 8 & 9.
$form['filed_name'] = [ '#markup' => '<h2>' . $node->get('field_name')->getString() . '$</h2>', ];
$form['filed_age'] = [ '#markup' => '<h4>' . $node->get('field_age')->getString() . '$</h4>', ];