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Add prefix / suffix to field by using template_preprocess_field

I remember in Drupal 7, this was possible. I need to add some HTML before a field and I don’t want to edit it in the Twig file. Is it somehow possible to add prefixes / suffixes by using the template_preprocess_field function?

I already tried something like that, but with no success:

function MYTHEME_preprocess_field(&$variables, $hook) {     $element = $variables['element'];     if ($element['#field_name'] === 'field_genre') {         $element[0]['#prefix'] = '<div class="project-info">';     }     if ($element['#field_name'] === 'field_duration') {         $element[0]['#suffix'] = '</div>';     } }
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Add prefix / suffix to field by using template_preprocess_field

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