public function initializeStructure()
    {
        $structure = [
            'id' => $this->getId(),
            'name' => $this->getName(),
            'description' => $this->getDescription(),
            'manualProgressionAllowed' => $this->manualProgressionAllowed,
            'steps' => [],
        ];

        $this->setStructure(json_encode($structure));

        return $this;
    }