How to setup kong with SSE (Server Side Events)

Questions
1

I’d like to setup my SSE route with kong 3.0.0. I have a route like

    - https_redirect_status_code: 426
      name: simplebackend-sse-subscribe
      path_handling: v0
      paths:
        - /v1/export/subscribe
      preserve_host: false
      protocols:
        - http
        - https

chatgpt recommends me to change protocols to sse but when I do it I get protocols: unknown type: sse error - how to fix it and correctly setup kong with sse ?