How to display accessory name in header field?

[justjam2013]

Current Situation

I opened ticket Enable device section folding.
In the process of investigating the issue, I discovered that I can get that functionality out of the box using both expandable and expanded, and making sure that items had a title property:

        "title": "Accessories",
        "type": "array",
        "items": {
          "title": "Accessory,
          "type": "object",
          "expandable": true,
          "expanded": false,
          "properties": {
            "accessoryName": {
              "title": "Accessory Name",
              "type": "string",
              "required": true
            },
          ...

It's not as pretty as the functionality provided by Homebridge UI, but it is functional:

However, I am unable to figure out how dynamically assign the accessory name to the section header, so all collapsed accessories show Accessory.
I tried using model.devices[arrayIndices].accessoryType.accessoryName but that didn't work as it displayed the string itself, not the accessory name:

How can I get the dynamic name to show up, like "My Suoer Duoer Switch" like in this mockup?

Logs

No response

Config

No response

Homebridge UI Version

5.0.0-beta.7

Homebridge Version

1.8.5

Node.js Version

22.9.0

Operating System

macOS

Environment Info

Using hb-service

Raspberry Pi Model

None

[justjam2013]

I found that the index of the item is available in the schema as the variable index and can be used as such:

          "title": "{{ $index }}",

What other variables are available?