%YAML 1.2
---
version: 1.1

leadership_1:
  description: a leadership
  type: leadership

  leader:  # a leader
    - value1
    - value2

  follower:  # a follower

leadership_2:
  description: a second leadership
  type: leadership

  leader:
    description: a leader
    default:
      variable: __.leadership_1.follower

  follower: val  # a follower
...