@BetaApi
  public static InstantiatingHttpJsonChannelProvider.Builder
      defaultHttpJsonTransportProviderBuilder() {
    return InstantiatingHttpJsonChannelProvider.newBuilder();
  }
Returns a builder for the default REST ChannelProvider for this service.
java-vertexai/google-cloud-vertexai/src/main/java/com/google/cloud/vertexai/api/stub/LlmUtilityServiceStubSettings.java