Display the description of a tag in single.html

Using this post as a reference, I’ve added a description for a custom taxonomy. It works as expected.

I’m referencing the custom taxonomy (called ‘nys’) on single.html, like so:

<ul id="nys">
    {{ range .Params.nys }}
      <li>
        <a href="{{ "/nys/" | relLangURL }}{{ . | urlize }}">
          {{ . }}
        </a>
      </li>
    {{ end }}
</ul>

I would like to render the description I’ve defined in /content/nys/itemname/_index.md, but I’m having trouble. {{ .Description | .Page.RenderString }} does not work. Can anyone help?

Seems you are an the taxonomy page but and want to access itemname in a subfolder.
No one to one mapping of the reference.

Would be much easier if you can share the code