<PackageReference Include="System.Configuration.ConfigurationManager" Version="6.0.0-preview.1.21102.12" />

SettingsDescriptionAttribute

public sealed class SettingsDescriptionAttribute : Attribute
Provides a string that describes an individual configuration property. This class cannot be inherited.
namespace System.Configuration { [AttributeUsage(AttributeTargets.Property)] public sealed class SettingsDescriptionAttribute : Attribute { private readonly string _description; public string Description => _description; public SettingsDescriptionAttribute(string description) { _description = description; } } }