How include class in optios

Hello I need help in include class personalize in options mi actuality code is this

add_filter( ‘woocommerce_checkout_fields’ , ‘extra_field’ );
function extra_field( $fields ) {

$documentos = array(
” => ‘Seleccione Tipo de Documento’,

);

$fields[‘billing’][‘tipo_documento’] = array(
‘input_class’ => array( ‘estilo select-display’),
‘label’ => __(‘Tipo de documento’, ‘woocommerce’),
‘required’ => true,
‘class’ => array(‘woocommerce-form-row woocommerce-form-row–wide form-row form-row-wide’)
);

$fields[‘billing’][‘tipo_documento’][‘type’] = ‘select’;
$fields[‘billing’][‘tipo_documento’][‘options’] = $documentos;

$fields[‘billing’][‘documento’] = array(
‘input_class’ => array( ‘estilo select-display’),
‘label’ => __(‘Documento’, ‘woocommerce’),
‘required’ => true,
‘class’ => array(‘form-row-first’),
‘options’ => array(
‘hola’
)
);

$documento = array(
‘0’ => __(‘Seleccione Documento’, ‘woocommerce’),
‘J’ => __(‘J’, ‘abe-documento’),
‘V’ => __(‘V’, ‘abe-documento’),
‘E’ => __(‘E’, ‘abe-documento’),
‘P’ => __(‘P’, ‘abe-documento’),
);

$fields[‘billing’][‘documento’][‘type’] = ‘select’;
$fields[‘billing’][‘documento’][‘options’] = $documento;
$fields[‘billing’][‘documento’][‘options’][‘class’] = ‘abe-documento’;

$fields[‘billing’][‘documento_id’] = array(
‘required’ => true,
‘label’ => __(‘ ‘, ‘woocommerce’),
‘placeholder’ => ‘33355777’,
‘class’ => array(‘form-row-last’)
);
return $fields;
}