My kind has a single field that can be an int or a string.

myKind.crd.yaml

apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  annotations:
  creationTimestamp: null
  name: mykinds.operators.coreos.com
spec:
  group: operators.coreos.com
  names:
    kind: MyKind
    listKind: MyKindList
    plural: mykinds
    singular: mykind
  scope: Namespaced
  versions:
  - name: v1alpha1
    schema:
      openAPIV3Schema:
        description: My kind has a single field that can be an int or a string.
        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
          intOrString:
            anyOf:
            - type: integer
            - type: string
            x-kubernetes-int-or-string: true
        required:
        - metadata
        type: object
    served: true
    storage: true
status:
  acceptedNames:
    kind: ""
    plural: ""
  conditions: []
  storedVersions: []