Include in upstream block

[Sergey Kobzar]

upstream backend {
         include /etc/nginx/backend.conf;
}

# nginx -t
nginx: [emerg] "include" directive is not allowed here in 
/etc/nginx/nginx.conf:37
nginx: configuration file /etc/nginx/nginx.conf test failed

# nginx -v
nginx: nginx version: nginx/1.0.4


Нельзя в блоке upstream делать инклуды?
Есть workaround кроме как парсить сам конфиг?

Спасибо.