Accessing custom, nested Quarto document metadata in other listings

_quarto.yml

project:
  type: website

index.qmd

---
title: "Doc metadata test - index"
author: "James"
listing:
  template: postlist.ejs
  id: mylisting
  contents: post*.qmd
---

Here's a listing of _all_ my posts, with links and the list of people in each:

:::{#mylisting style="background-color: #eeeeee"}
:::

Listing over!

post.ejs

```{=html}
<% for (const person of items) { %>
  <h2><%= person.name %></h2>
  <ul>
    <% for (const link of person.links) { %>
    <li><%= link %></li>
    <% } %>
  </ul>
<% } %>
```

post1.qmd

---
title: "Doc metadata test - post 1"
listing:
  template: post.ejs
  id: mylisting
  contents: 
    - name: James
      links:
        - linkedin
        - twitter
---

My listing is going to go here:

:::{#mylisting style="background-color: #999999"}
:::

Listing over!

post2.qmd

---
title: "Doc metadata test - post 2"
listing:
  template: post.ejs
  id: mylisting
  contents:
    - name: Sam
      links:
        - pixabay
        - facebook
---

My listing is going to go here:

:::{#mylisting style="background-color: #eeeeee"}
:::

Listing over!

postlist.ejs

```{=html}
<h1>All people</h1>
<% for (const doc of items) { %>
  <a href="<%= doc.path %>"><h2><%= doc.title %></h2></a>
  <h3>People in this post:</h3>
  <% for (const person of doc.listing.contents) { %>
  <h4><%= person.name %></h4>
  <ul>
    <% for (const link of person.links) { %>
    <li><%= link %></li>
    <% } %>
  </ul>
  <% } %>
<% } %>
```