# For example, a Entity model which has that declaration:
has_many_attached :images do |attachable|
  attachable.variant :high, resize_to_limit: [1080, 1080], format: :webp, saver: { strip: true }
  attachable.variant :low, resize_to_limit: [256, 256], format: :png, saver: { strip: true, quality: 80 }
end

# It's possible to get like this
Entity.attachment_reflections["images"].named_variants.keys
# => [:high, :low]