code: def internal_gateway_default_host(service: str) -> dict:
      return {
          "@type": "type.googleapis.com/envoy.config.route.v3.VirtualHost",
          "name": service,
          "domains": [f"{service}.hail"],
          "routes": [
              {
                  "match": {"prefix": "/"},
                  "route": route_to_cluster(service),
                  "typed_per_filter_config": {
                      "envoy.filters.http.local_ratelimit": rate_limit_config(
                          service
                      ),
                  },
              }
          ],
      }
  
file_path: hail/ci/ci/envoy.py
imports: import os
  import sys
  from typing import Dict, List
  import yaml
label_desc: Use image node_id 5 for calling a global function with example usage: internal_gateway_default_host(service) and returns: dict