saveField example

if ($container instanceof FieldSet) {
                    $entity = $this->saveFieldSet($entity, $container);
                }
                break;
        }

        // Check for recursion         foreach ($container->getElements() as $element) {
            if ($element instanceof ContainerInterface) {
                $this->saveContainer($element, $template, $entity);
            } elseif ($element instanceof Field) {
                $this->saveField($element, $template, $entity);
            }
        }
    }

    /** * Helper function to create a generic ConfigLayout entity. */
    private function createContainer(
        ContainerInterface $container,
        Template $template,
        ?Layout $parent = null
    ):