C# - How to use custom assembly attribute in *.nuspec file?

Question

I have created following class which is a definition of custom attribute:

using System;

namespace Gucu112.ConfigurationHelper.Properties
{
    [AttributeUsage(AttributeTargets.Assembly)]
    public sealed class AssemblyReleaseNotesAttribute : Attribute
    {
        public AssemblyReleaseNotesAttribute(string releaseNotes) : base()
        {
            ReleaseNotes = releaseNotes;
        }

        public string ReleaseNotes { get; }
    }
}

Then I have defined this custom attribute in my AssemblyInfo.cs file:

(...)
[assembly: AssemblyReleaseNotes("Example release notes.")]
(...)

What I would like to do is use the attribute as variable in my *.nuspec file (as described for some other assembly attributes here):

<?xml version="1.0"?>
<package>
    <metadata>
        <id>$id$</id>
        (...)
        <description>$description$</description>
        <releaseNotes>$releaseNotes$</releaseNotes>
        (...)
    </metadata>
</package>

However, after pushing the package to the NuGet gallery I cannot see content of my custom attribute. Is there any way to make it works? Thank you in advance for you help.