Set Default Input for Pages Field Blueprint

I like to set a default page when a new “article” is create. See screenshot attached.

author:
  label: Author
  type: pages
  min: 1
  max: 1
  query: site.index(true).template("single-author")
  default: <What do I put here?>
  width: 1/3

Screenshot 2021-08-06 at 10.40.35

The id of a page:

author:
  label: Author
  type: pages
  min: 1
  max: 1
  query: site.index(true).template("single-author")
  default:
    - notes/through-the-desert
  width: 1/3

@pixelijn Thanks. This is perfect!

does it accept a collection as well? It is not working for me :frowning: I need a set of subpages and the IDs can obviously change. I am trying:

materials:
   label: Materialien
   type: pages
   default: site.children.filterBy('intendedTemplate','material')

but it is not working

Queries for default values are not supported: Support query templates in `default` field property · Kirby Feedback