Александр Владимирович

В качестве временного решения сделал так:

SomeBundleExtension.php

public function load(array $configs, ContainerBuilder $container)
    {
        $loader = new YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
        $loader->load('services.yaml');
        $configuration = $this->getConfiguration($configs, $container);
        $config = $this->processConfiguration($configuration, $configs);
        $container->setParameter('some_bundle.config', $config);
    }

MyController.php

$config = $this->container->getParameter('some_bundle.config');
dd($config);