Use own Ignition config for Fedora Iot?

As I’ve noticed here Fedora Iot seems to only use Ignition for provisioning a device with that web config tool Zezere.

The main home page states:

With the Ignition provisioning utility and Zezere web service, administrators can deploy and configure Fedora IoT in a scalable manner without needing a physical console.

However I can only find something about Ignition related to that service, so it’s not that scalable if you have to click-through a web interface, is not it?

As such, is there also a way to use my own Ignition config for provisioning the device instead of the Zezere-generated one/skip the Zezere service?