[Prestashop 1.7.6.7] : new field for customer not filled in "my account"

[stephtkd]

Hi,
I'm developping a new module which add a new field 'privilege code' to customers.
I created a new table for that.
In back office I see the new field in customer listing (thanx to the hooks hookActionCustomerGridQueryBuilderModifier et hookActionCustomerFormBuilderModifier))

But in front office I see this field in Your account >> your personnal information but it is empty.
I don't know how to tell Prestashop how to fill this field

What would be the best way to do that ? hooks ?

Thank to you

Stéphane