I have the following code to get the value that is stored in a field

    $nid = 76;
    $node = \Drupal::service('entity.manager')->getStorage('node')->load($nid);
    foreach ($node->field_aaaa as $delta) {      
      dpm($delta->value);
    }

With this I can get the correct value let says:

     * id_string1
     * id_string2
     * id_string3

But my field have a Field Formatter named `title_formatter` that will take the string `id_string1` and will show something like this:

    String 1

In the UI this works fine if I chose my Title Formatter (title_formatter) for the field I can see the `'String'` when I viewing my node.

But I don't know how to apply the Field Formatter programmatically to the field values.