/**
* Implements hook_entity_base_field_info().
*/
function YOUR_MODULE_NAME_entity_base_field_info(EntityTypeInterface $entity_type) {
$fields = array();
if ($entity_type->id() == 'YOUR_ENTITY_TYPE') { // Replace with your entity type ID
$fields['custom_concatenated_name_field'] = BaseFieldDefinition::create('string')
->setLabel(t('Custom Concatenated Name'))
->setDescription(t('The concatenated name field.'))
->setSortable(TRUE); // Enables sorting on this field
// Additional settings for your field can be added here
}
return $fields;
}