Alter result webform list


In the result webform list, I would like a column “status” with a select for each row result with 3 choices “being validated”, “valid”, “rejected” and a button to save all the status values.

I have some ideas :
– Use a bulk operation field in the webform result view. But I don’t really know how to create a custom bulk operation and if it is the good way.
– Use hooks : view form or webform. Which one and how ?

Sorry for my english
Thanks for your precious help

Drupal version: