config.neon

extensions:
    flysystem: wodCZ\Flysystem\DI\FlysystemExtension

flysystem:
	storages:
		remoteFiles:
			adapter: League\Flysystem\Adapter\Ftp
			host: ftp.example.com
			username: john
			password: letMeIn

FlysystemExtension.php

<?php

namespace wodCZ\Flysystem\DI;

use Nette;
use Nette\DI\CompilerExtension;

class FlysystemExtension extends CompilerExtension
{
	public function loadConfiguration()
	{
		$config  = $this->getConfig();
		$builder = $this->getContainerBuilder();

		if(empty($config["storages"])){
			return;
		}
		foreach ($config["storages"] as $service => $settings) {
			$adapter = $settings["adapter"];
			unset($settings["adapter"]);

			$builder->addDefinition($this->prefix($service . "Adapter"))
				->setClass($adapter, [$settings]);
			$builder->addDefinition($this->prefix($service))
				->setClass('League\\Flysystem\\Filesystem', [$this->prefix('@' . $service . "Adapter")]);

		}
	}
}