Can I generate the .event or .channel definition file from open source flowable-app-ui?

Greeting, anyone knows that if I can export the “.event” or “.channel” definition file from the open source flowable-app-ui application?

Or I can only write them by myself? or export them from flowable cloud designer? Looks like I don’t see any definition format specification in doc, not sure if I missing this part of content in doc.

thanks.

Can you share the link from where u are cloning the open-source flowable-app-ui ?