Use FormTheme for CollectionType? - symfony

Question

I'm using for my symfony project the Ninsuo JqueryCollection plugin https://symfony-collection.fuz.org/symfony3/, and I have a form that has a collectionType, except that I want the targeted entity to appear with its own layout, but I do not know how to apply it to CollectionType
I have my "subform" like this
SubForm :
{{form_start(form)}}
<div class="card">
<h5 class="card-header">Nouvel utilisateur</h5>
<div class="card-body">
{{form_row(form.email)}}
<div class="row align-items-center">
<div class="col-md-4">
{{form_row(form.nom)}}
</div>
<div class="col-md-4">
{{form_row(form.prenom)}}
</div>
<div class="col-md-4">
{{form_row(form.service)}}
</div>
</div>
{{form_row(form.roles)}}
</div>
</div>
{{form_end(form)}}
And my main Form :
{{form_start(form)}}
{{form_row(form.utilisateurs, {'attr': {'class': 'my-selector jquery-buttons-collection mt-3'} })}}
<button type="submit" class="btn btn-primary">Enregistrer</button>
{{form_end(form)}}
I would like to apply the layout of the 1st form for my form.users. Someone would know how?
EDIT:
My main form :
$builder
->add('utilisateurs', CollectionType::class, [
'entry_type' => AdminUserRegistrationType::class,
'entry_options' => [
'label' => false,
],
'allow_add' => true,
'allow_delete' => true,
'delete_empty' => true,
'by_reference' => true,
'prototype' => true,
'label' => false,
'attr' => array(
'class' => 'my-selector',
'label' => false,
),
'by_reference' => false,
]);
;
With the template :
{{form_start(form)}}
{{form_row(form.utilisateurs, {'attr': {'class': 'my-selector jquery-buttons-collection mt-3'} })}}
<button type="submit" class="btn btn-primary">Enregistrer</button>
{{form_end(form)}}
The form.utilisateurs formType :
$builder
->add('nom', TextType::class)
->add('prenom', TextType::class)
->add('email', EmailType::class)
->add('service', EntityType::class, [
'class' => GroupeValidateurs::class,
'query_builder' => function (GroupeValidateursRepository $repo) {
return $repo->createQueryBuilder("g")
->orderBy("g.nom", 'ASC');
},
'choice_label' => 'nom',
'label' => "Service",
'placeholder' => 'Service'
])
->add('roles', ChoiceType::class, [
'label' => "Rôles",
'choices' => [
'Admin' => 'ROLE_ADMIN',
'Direction' => 'ROLE_DIRECTION',
'RH' => 'ROLE_RH',
],
"expanded" => true,
"multiple" => true,
])
;
And the form theme :
{% block utilisateursType_label %}{% endblock %}
{% block utilisateursType_errors %}{% endblock %}
{% block utilisateursType_widget %}
<div class="card">
<h5 class="card-header">Nouvel utilisateur</h5>
<div class="card-body">
{{form_widget(form.email)}}
<div class="row align-items-center">
<div class="col-md-4">
{{form_widget(form.nom)}}
</div>
<div class="col-md-4">
{{form_widget(form.prenom)}}
</div>
<div class="col-md-4">
{{form_widget(form.service)}}
</div>
</div>
{{form_widget(form.roles)}}
</div>
</div>
{% endblock %}
But I don't know how find the block name