Say it without sugar

The value is real, and the short spelling has no production for it.

app reviews "Reviews" {}

entity Article {
  owner: text

  workflow {
    initial Draft
    states Draft, Published
    terminal Published

    publish: Draft -> Published guard jsonlogic { if: [{ var: "owner" }, true, false] }
  }
}

A guard the expression grammar can already say stays requires or when.