Example with mandatory variables not filled in

leadership:                   # A leadership
  - leader: example           # A leader
    follower1: example        # A follower
    follower2: example        # An other follower

Example with all variables modifiable

leadership:                   # A leadership
  - leader: example           # A leader
    follower1: example        # A follower
    follower2: example        # An other follower