By default it should be displayed on cart of the checkout thanks to this code:
if(hikashop_level(2) && !empty($this->extraFields['item'])){
foreach($this->extraFields['item'] as $field){
$namekey = $field->field_namekey;
if(empty($row->$namekey)) continue;
echo '<p class="hikashop_cart_item_'.$namekey.'">'.$this->fieldsClass->getFieldName($field).': '.$this->fieldsClass->show($field,$row->$namekey).'</p>';
}
}
In the view "checkout / cart".
And in the email thanks to this code:
if(!empty($itemFields)){
foreach($itemFields as $field){
$namekey = $field->field_namekey;
if(empty($item->$namekey)) continue;
echo '<p>'.$fieldsClass->getFieldName($field).': '.$fieldsClass->show($field,$item->$namekey).'</p>';
}
}