You can do that by including a

patch

for the deployment to add those fields, something like:

apiVersion: authzed.com/v1alpha1
kind: SpiceDBCluster
metadata:
  name: dev
spec:
  config:
    datastoreEngine: memory
  secretName: dev-spicedb-config
  patches:
  - kind: Deployment
    patch:
      spec:
        template:
          spec:
            tolerations:
            - key: "example-key"
              operator: "Exists"
              effect: "NoSchedule"