Azure SignalR service with Serverless

Serverless Framework
1

Is it possible at all? I’m trying to convert the following function.json to Serverless yml definition:

{
  "bindings": [
      {
          "authLevel": "function",
          "type": "httpTrigger",
          "direction": "in",
          "name": "req",
          "methods": ["get"]
      },
      {
          "type": "signalRConnectionInfo",
          "name": "connectionInfo",
          "hubName": "your-signalr-service-name",
          "connectionStringSetting": "connection-string",
          "direction": "in"
      }
  ]
}

The first event is pretty straightforward:

Web_SirnalRNegotiate:
  handler: src/handlers/web/negotiate
  events:
    - http: true
      x-azure-settings:
        route: web/{version}/negotiate
        methods:
          - GET
        authLevel: function

But how do I describe the second binding?