Form type markup states

Question

Is it possible to create a form element of type markup and add a state to it, to make it visible on a condition? I can't seem to make it work and get the error:

Warning: Undefined array key "#type" in Drupal\Core\Form\FormHelper::processStates() (line 211 of core/lib/Drupal/Core/Form/FormHelper.php)

I need to just add some text in the form and make it visible on a condition.

Any help would be appreciated, thanks!

Answer 1

Adding form type item did the trick:

$form['my_incomes'] = [
      '#type' => 'item',
      '#markup' => $this->t('My other incomes'),
      '#states' => [
        'visible' => [
          [':input[name="marital_status"]' => [['value' => 'single'],['value'=>'couple']]],
        ]
      ]
    ];