I am trying to add a new text field to the menu in Drupal 8, and I have done it using the instruction in the following post:

Add field(s) to menu link?

function my_module_entity_base_field_info(\Drupal\Core\Entity\EntityTypeInterface  $  entity_type) {   if ($  entity_type->id() === 'menu_link_content') {     $  fields['location'] = BaseFieldDefinition::create('string')       ->setLabel(t('Location'))       ->setDisplayOptions('view', ['label' => 'hidden', 'type' => 'string', 'weight' => 0, ])       ->setDisplayOptions('form', array('type' => 'string', 'weight' => 0));      return $  fields;   } } 

But I am not sure how to go about using hook_update_n to update the schema to reflect this change.

function menu_link_content_update_8201() { 'what do I put here to add the new field that I created'? } 

I was able to workaround this issue by manually adding the location column in the mysql db and I can see the field showing up in the menu link editor and able to load and save it just fine in the cms UI.

But then I am not sure how to access this field in the twig file.

Any help would be grateful. Thanks!