How to retrieve firewall rules of an organization network

With .NET SDK, by updating the NetworkConfigurationType.Features I can override the firewall rules of an organization network. I can check it in the vCloud Director.

Saying override because I cannot find a way to retrieve the current firewall rules. To me the Features property is write only. So I cannot actually do an Update operation.

I cannot find any documentation about this. But in the vCloud Director I can edit/delete firewall rules. So I assume there must be a way to read them.

Can somebody provide more detail to read the Features? If it is not do-able in .NET SDK, then how to do it through the REST API?