如何将我的类添加到我在drupal中定义的自定义字段？

name: My Custom Module
type: module
description: Adds a custom class to a custom field in Drupal.
core_version_requirement: ^8 || ^9
package: Custom
dependencies:
  - field

<?php

use Drupal\field\Entity\FieldConfig;
use Drupal\field\Entity\FieldStorageConfig;

/**
 * Implements hook_install().
 */
function my_custom_module_install() {
  // Create a custom field storage.
  FieldStorageConfig::create([
    'field_name' => 'my_custom_field',
    'entity_type' => 'node',
    'type' => 'text',
    'cardinality' => 1,
  ])->save();

  // Create a custom field.
  FieldConfig::create([
    'field_name' => 'my_custom_field',
    'entity_type' => 'node',
    'bundle' => 'article', // Replace with your desired content type.
    'label' => 'My Custom Field',
    'description' => 'This is a custom field.',
  ])->save();
}

<?php

namespace Drupal\my_custom_module;

/**
 * Custom class for the custom field.
 */
class MyCustomClass {
  // Add your custom class code here.
}

<?php

use Drupal\Core\Field\FieldItemListInterface;

/**
 * Implements hook_field_widget_WIDGET_TYPE_form_alter().
 */
function my_custom_module_field_widget_text_textfield_form_alter(&$element, FieldItemListInterface $items, $form, &$form_state) {
  // Add your custom class to the field element.
  $element['#attributes']['class'][] = 'my-custom-class';
}