How to define a CRD with recursive structs

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Cluster information:

Kubernetes version: v1.19
Cloud being used: (put bare-metal if not on a public cloud)
Installation method:
Host OS: CentOS
CNI and version:
CRI and version:

Hi! I’m writing to call for help about how to define a CRD with recursive structs. My requirements are as follows:
I want to defnie a CRD to represent hierarchical queue. Just like this

root
├─ n1
│  ├─ n1,1
│  ├─ n1,2
│  └─ n1,3
├─ n2
│  ├─ n2,1
│  ├─ n2,2

In the hierarchical queue above, root represents the root node. Other nodes are with the same struct defined as follows:

type node struct {
      parent *node
      weight int
}

So how can I define the CRD HierarchicalQueue in spec? THX.

apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  annotations:
    controller-gen.kubebuilder.io/version: v0.6.0
  creationTimestamp: null
  name: hierarchicalqueue.scheduling.volcano.sh
spec:
  group: scheduling.volcano.sh
  names:
    kind: HierarchicalQueue
    shortNames:
      - hq
  scope: Cluster
  versions:
    - name: v1alpha1
      schema:
        openAPIV3Schema:
          description: HierarchicalQueue is the Schema for the Hierarchical Queue API
          properties:
            apiVersion:
              description: 'APIVersion defines the versioned schema of this representation
              of an object. Servers should convert recognized schemas to the latest
              internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources'
              type: string
            kind:
              description: 'Kind is a string value representing the REST resource this
              object represents. Servers may infer this from the endpoint the client
              submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds'
              type: string
            metadata:
              type: object
            spec:
              description: Specification of the hierarchical queue
              properties:
                queues:
                  ## TODO: definition of queues recursively
      served: true
      storage: true