8 – Access user entity reference in a commerce-product twig

I have a field named field_intervenant who is a reference to my Users.
In my commerce-product twig I want to access to the description field of each of my ‘intervenant’, does anyone know the way to do it ?
Here is what I tried :

product.field_intervenants.entity.field_description
product.field_intervenants.0.entity.field_description
product_entity.field_intervenants.0.entity.field_description
product_entity.field_intervenants.field_description
product_entity.field_intervenants.field_description.value

As long as some others but never gave me back something, and I can’t find it in my kint aswell, do I need to loop through it or am I missing something else?
Thanks for your help!