Doctrine yml格式唯一约束

我想为我的yml方案添加一个候选密钥。yml有可能吗？我该怎么做？我在谷歌上找不到任何东西

编辑：这也可能与独特的约束？如果是这样的话，我试过了

uniqueConstraints:
  name_presId:
    columns:  name, presentationId

致以最良好的祝愿， 给出了以下结构：

---
EFImage:
tableName: ef_images
columns:
presentation_id as presentationId: integer
data: blob
name: string(255)
is_sendable as isSendable:
  type: integer(4)
  default: 0
use_for as useFor: 
  type: integer(4)
  default: 0
  relations:
ButtonBackgrounds:
  class: EFButton
  foreign: backgroundImageId
  local: id
  type: many
ImageViews:
  class: EFImageView
  foreign: imageId
  local: id
  type: many
Videos:
  class: EFVideo
  foreign: previewImageId
  local: id
  type: many
Presentation:
  class: EFPresentation
  local: presentationId
  foreign: id
  type: one
options:
type: InnoDB