<PackageReference Include="System.Configuration.ConfigurationManager" Version="8.0.0-preview.2.23128.3" />

IInternalConfigRoot

public interface IInternalConfigRoot
bool IsDesignTime { get; }

object GetSection(string section, string configPath)

string GetUniqueConfigPath(string configPath)

void Init(IInternalConfigHost host, bool isDesignTime)

void RemoveConfig(string configPath)