This exposed marketplace images API in NodePools https://github.com/openshift/hypershift/pull/4191.
here might be many use cases where API consumer will need to differentiate and market place image need to be passed explicitly.
We also need to account in the API for the case where if nothing is passed explicitly we default a happy path.
This ticket is to implement the latter once there's prebuild images in well known locations we can infer via rhcos.json or ocp version https://github.com/openshift/enhancements/pull/1655/files#diff-29b26786016454d6f20111d0d8ef39f0bf3d0fb94ec5f65450be55e321b4f58cR80.