How to set grpc.dns_enable_srv_queries=1?

We are migrating our project to grpc.net, what's the right way to set **grpc.dns_enable_srv_queries=1?**

```
Channel channel = new Channel("dns://127.0.0.1:8010/test.my-company.com", ChannelCredentials.Insecure, new[]
{
new ChannelOption("grpc.lb_policy_name", "grpclb"),
new ChannelOption("grpc.service_config", "{\"serviceConfig\":{\"load_balancing_config\":{ \"grpclb\": {} },\"waitForReady\":true}}"),
new ChannelOption("grpc.dns_enable_srv_queries", 1)
});
```

No project file or test is mentioned. Start by reading the grpc.net Channel and ChannelOption documentation for DNS resolver and service configuration options, then verify whether grpc.dns_enable_srv_queries is supported; done means the supported configuration method is documented or clearly answered.

Written by the indexing model from the issue text.