Very great presentation! I made a little toy some time ago [1] with YAML files compiled into Javascript code, in Lisp style, basically along the same lines as the article, and I use this project to manage my dotfiles. The basic syntax probably looks like this:

  - use: def
    id: obj
    args:
      list:
        - Hello
        - true
      foo:
        cat: 10
  - use: console.log
    args:
      - ${obj.list[0]} World
      - ${obj.foo.cat}
      - ${JSON.stringify(obj.foo)}

[1]: https://github.com/yamlscript/yamlscript