Change Doctrine translations "ext_translations" public schema to a custom one - postgresql

Question

I'm using stof/doctrine-extensions-bundle with the Translatable extension for my entities (& doctrine/doctrine-migrations-bundle) and want to move ext_translations table from the public schema to a custom schema (e.g. product)
product.ext_translations table is created with bin/console doctrine:migrations:migrate
but when I want to import some data with this script:
use App\Infrastructure\Translatable\Entity\Translation\Translation;
...
$repository = $em->getRepository(Translation::class);
$colorEntity = new Color();
$colorEntity->setName("bleu");
$repository->translate($colorEntity, 'name', 'en', 'blue');
$em->persist($colorEntity);
$em->flush();
I get this error
[error] Migration App\Migrations\VersionXXX failed during Post-Checks. Error: "An exception occurred while executing a query: SQLSTATE[42P01]: Undefined table: 7 ERROR: relation "ext_translations" does not exist
LINE 1: INSERT INTO ext_translations (locale, object_class, field, f...
Here is my conf:
doctrine.yaml
orm:
mappings:
Translatable:
type: annotation
is_bundle: false
prefix: App\Infrastructure\Translatable\Entity
dir: '%kernel.project_dir%/src/Infrastructure/Translatable/Entity'
alias: GedmoTranslatable
Metadata:
is_bundle: false
type: xml
dir: '%kernel.project_dir%/src/Infrastructure/ORM/Mapping/Metadata'
prefix: 'App\Domain\Metadata'
alias: Metadata
Color.orm.xml mapping file
<entity name="App\Domain\Metadata\Color" table="colors" schema="product" repository-class="App\Infrastructure\ORM\Repository\ColorRepository">
<id name="id" type="integer" column="id">
<generator strategy="AUTO"/>
</id>
<field name="name" type="string">
<gedmo:translatable/>
</field>
...
<gedmo:translation entity="App\Infrastructure\Translatable\Entity\Translation" locale="locale"/>
</entity>
App\Infrastructure\Translatable\Entity\Translation
<?php
namespace App\Infrastructure\Translatable\Entity;
use ...
/**
* #ORM\Table(name="ext_translations", schema="product", indexes={
* #ORM\Index(name="translations_lookup_idx", columns={"locale", "object_class", "field", "foreign_key"})
* })
* #ORM\Entity(repositoryClass="Gedmo\Translatable\Entity\Repository\TranslationRepository")
*/
class Translation extends AbstractTranslation
{
/**
* All required columns are mapped through inherited superclass
*/
}