Extension method for string variable to read attribute

I have a class with string constants:

public static class Days 
{
    [Description("Wow!")]
    public const string Mon = "Hi!";
}

I've found that it is possible for enum to have an extension method to read Description attribute:

using System.ComponentModel;
public enum Days 
{    
    [Description("Wow!")]
    Mon
}

An extension method for enum:

public static string ToName(this Enum value) 
{
    var attribute = value.GetAttribute<DescriptionAttribute>();
    return attribute == null ? value.ToString() : attribute.Description;
}

And call it like that:

Days.Mon.ToName()

Is it possible to write an extension method for string to get Wow! from Description attribute of Mon string variable and call extension method for string like that?

string description = Days.Mon.ToName(); // Output: "Wow!"