Plugin: adding formatted array of annotations with AddAnnotationFix

I'm using a AddAnnotationFix to add custom annotations. One of which is an annotation containing an array of other annotations.

When I create the string to pass to AddAnnotationFix, I concatenate all the "@Used(clazz = b.class), " by ",\n" hoping to see them going to new lines like in the example. 

I don't understand if it is a style configuration problem (which properties are making everything in line!?) or I'm doing something wrong when creating the annotation.

Result:  

@UsedList({@Used(clazz = a.class), @Used(clazz = b.class), @Used(clazz = c.class), @Used(clazz = d.class)})

Expected:

@UsedList({
  @Used(clazz = a.class), 
  @Used(clazz = b.class), 
  @Used(clazz = c.class), 
  @Used(clazz = d.class)
})