How to use a CRD?

[yajo]

I'm using Metacontroller.

To create a controller, I can create a CRD and then define a CompositeController object to observe objects of that CRD type.

I'm trying to translate my YAMLs to nix with kubenix but I can't find the appropriate way to do it.

How to declare a CRD?

Am I able to use a CRD without having to declare it? For example, for cases when I installed those CRD by other means in the cluster, but I want to manage their resources with kubenix.

If I declare the CRD with kubenix, can I automatically define resources, or do I have to declare custom types? How? Is there some function available to parse the spec of a CRD into nix module definitions?

This is confusing... 😵