[opensuse-buildservice] use kiwi result as build-requirement

Hi,

Is it possible to use kiwi build products as build-requirements for rpm builds?

I would like to do the following: get rootfs tar.gz of some kiwi build, repack it into /var/lib/container/myservice and utilize systemd-nspawn. So, effectively, I will get an rpm with the service which I will be able to install, enable and run as following:

zypper in myservice systemctl enable systemd-nspawn@myservice.service systemctl start systemd-nspawn@myservice.service

This is only an idea for private use, of course, I am not going to do that with real services.