dictionaries/rougail/00-base.yml

---
version: '1.1'
var1:  # a second variable
  - a
  - b
  - c
var2:
  description: a first variable
  default: a
  choices:
    variable: _.var1

Example with all variables modifiable

---
rougail:
  var1:
    - a
    - b
    - c
  var2: a