HarmonyOS promptAction弹窗如何设置边框角度borderRadius

dialogController: CustomDialogController | null = new CustomDialogController({  
  builder: CustomDialogExample({  
    cancel: ()=> { this.onCancel() },  
    confirm: ()=> { this.onAccept() }  
  }),  
  cancel: this.existApp,  
  autoCancel: true,  
  alignment: DialogAlignment.Center,  
  offset: { dx: 0, dy: -20 },  
  gridCount: 4,  
  showInSubWindow: true,  
  isModal: true,  
  customStyle: false,  
  cornerRadius: 10,  
})