'this' in query lang in structure item

The CMS Questions
1

Is there a ‘this’ keyword when using query lang inside a structure item ?

And, can I do something like this to get the sorting number of a page whose ID is a field in the structure item ?

       items:
        label: Items
        type: structure
        width: 1/1
        fields:
          id:
            label: ID
            type: text
          number:
            label: Product Number
            type: info
            text: >
              {{ site.find(this.id).num }}
        ...

This is an example of what is on the .txt file for this structure field:

    Items:

    - 
      id: apple-bank
      quantity: 1
      price: 20
      tax: 3.4710743801653
      frames: "0"
      taxrate: 21
      title: Apple Bank
      sum: 20
      sumtax: "3.4710743801653"
    -

Thanks

2

Not possible. There was an idea about that:

3

Ah I see, too bad.

Thank you.