use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Element;
// Create a form element callback function to build the select element.
function custom_select_element_callback(array &$form, FormStateInterface $form_state) {
// Define the select options.
$options = [
'option1' => 'Option 1',
'option2' => 'Option 2',
'option3' => 'Option 3',
];
// Build the select element.
$element = [
'#type' => 'select',
'#title' => t('Select an option'),
'#options' => $options,
'
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