Example with mandatory variables not filled in

---                                                                             
extra:                                                                          
  dyn_a:                                                                        
    var: example                                                                

Example with all modifiable variables

---                                                                             
rougail:                                                                        
  var:                                                                          
    - a                                                                         
extra:                                                                          
  dyn_a:                                                                        
    var: example