How to add class to content field link in Drupal 8 / 9

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Example How to add custom class to content field link in Drupal 8 & 9.

function THEMENAME_preprocess_field(&$variables, $hook) {
  $element = $variables['element'];
  if ($element['#field_name'] == 'field_link') {
    $variables['items'][0]['content']['#options']['attributes']['class'][] = 'btn  btn-danger';
  }
}

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