Get drupal field formatter settings

field_formatter_settings.php

<?php

$entity_type = 'node';
$bundle = 'layout';
$field_name = 'field_layout_region1_items';
$setting_name = 'promo';

// Get selected view modes for bundle
$view_modes = \Drupal::service('entity_display.repository')
  ->getViewModeOptionsByBundle(
    $entity_type, $bundle
  );

// Get format settings for field
foreach (array_keys($view_modes) as $view_mode) {
  $settings = \Drupal::service('entity_type.manager')
    ->getStorage('entity_view_display')
    ->load($entity_type . '.' . $bundle . '.' . $view_mode)
    ->getRenderer($field_name);
  // Get settings I need.
  dpm($settings);
}


/* 
OUTPUT:


Array
(
    [link] => 1
)
Array
(
    [link] => 1
)
stdClass Object
(
    [__CLASS__] => Drupal\Core\Field\Plugin\Field\FieldFormatter\EntityReferenceLabelFormatter
    [fieldDefinition:protected] => stdClass Object
        (
            [__CLASS__] => Drupal\field\Entity\FieldConfig
            [deleted:protected] => 
            [fieldStorage:protected] => 
            [id:protected] => node.layout.field_layout_region1_items
            [field_name:protected] => field_layout_region1_items
            [field_type:protected] => entity_reference
            [entity_type:protected] => node
            [bundle:protected] => layout
            [label:protected] => Region 1 Items
            [description:protected] => 
            [settings:protected] => Array
                (
                    [handler] => default:node
                    [handler_settings] => Array
                        (
                            [behaviors] => Array
                                (
                                    [views-select-list] => Array
                                        (
                                            [status] => 0
                                        )

                                )

                            [sort] => Array
                                (
                                    [field] => _none
                                    [direction] => ASC
                                )

                            [target_bundles] => Array
                                (
                                    [promo] => promo
                                )

                        )

                )

            [required:protected] => 
            [translatable:protected] => 
            [default_value:protected] => Array
                (
                )

            [default_value_callback:protected] => 
            [itemDefinition:protected] => 
            [constraints:protected] => Array
                (
                )

            [propertyConstraints:protected] => Array
                (
                )

            [originalId:protected] => node.layout.field_layout_region1_items
            [status:protected] => 1
            [uuid:protected] => 7d2cc7ea-820d-4811-b8c0-45e53ea7fa80
            [isSyncing:Drupal\Core\Config\Entity\ConfigEntityBase:private] => 
            [isUninstalling:Drupal\Core\Config\Entity\ConfigEntityBase:private] => 
            [langcode:protected] => en
            [third_party_settings:protected] => Array
                (
                )

            [_core:protected] => Array
                (
                )

            [trustedData:protected] => 
            [entityTypeId:protected] => field_config
            [enforceIsNew:protected] => 
            [typedData:protected] => 
            [cacheContexts:protected] => Array
                (
                )

            [cacheTags:protected] => Array
                (
                )

            [cacheMaxAge:protected] => -1
            [_serviceIds:protected] => Array
                (
                )

            [dependencies:protected] => Array
                (
                    [config] => Array
                        (
                            [0] => field.storage.node.field_layout_region1_items
                            [1] => node.type.layout
                            [2] => node.type.promo
                        )

                )

        )

    [settings:protected] => Array
        (
            [link] => 1
        )

    [label:protected] => above
    [viewMode:protected] => default
    [thirdPartySettings:protected] => Array
        (
        )

    [defaultSettingsMerged:protected] => 
    [pluginId:protected] => entity_reference_label
    [pluginDefinition:protected] => Array
        (
            [field_types] => Array
                (
                    [0] => entity_reference
                )

            [id] => entity_reference_label
            [label] => stdClass Object
                (
                    [__CLASS__] => Drupal\Core\StringTranslation\TranslatableMarkup
                    [translatedMarkup:protected] => 
                    [options:protected] => Array
                        (
                        )

                    [stringTranslation:protected] => 
                    [string:protected] => Label
                    [arguments:protected] => Array
                        (
                        )

                )

            [description] => stdClass Object
                (
                    [__CLASS__] => Drupal\Core\StringTranslation\TranslatableMarkup
                    [translatedMarkup:protected] => 
                    [options:protected] => Array
                        (
                        )

                    [stringTranslation:protected] => 
                    [string:protected] => Display the label of the referenced entities.
                    [arguments:protected] => Array
                        (
                        )

                )

            [class] => Drupal\Core\Field\Plugin\Field\FieldFormatter\EntityReferenceLabelFormatter
            [provider] => core
            [quickedit] => Array
                (
                    [editor] => form
                )

        )

    [configuration:protected] => Array
        (
        )

    [stringTranslation:protected] => 
    [_serviceIds:protected] => Array
        (
        )

)


*/