Sorting and displaying existing civicrm Contacts in Webform

Hello, I created a Webform and I get all my Civi Crm contacts thanks to the module Civi CRM Integration.
The contacts displayed in the select list are sorted by last name. Which is great. But in the list I read "first name last name" and because it's sorted by last name I'd prefer read "last name first name"
Any help ?
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