如何给 K8S Nginx Ingress 添加 proxy_set_header 配置?

apiVersion: extensions/v1beta1 
kind: Ingress
metadata:
  name: cnblogs-ingress
  annotations:
    nginx.org/location-snippets: |
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection $connection_upgrade;
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