Picture-element - rotate camera stream by 90 deg

Configuration
1

I’d like to get landscape ~full screen view on mobile app ,
the image i’m using is a black background with size of my cellphone resolution .
I used picture-element with custom:webrtc-camera card
so i could rotate it ,
it is working in preview mode only

any idea?

type: picture-elements
elements:
  - type: custom:webrtc-camera
    entity: camera.intercom_camera
    muted: false
    style:
      rotate: 90deg
      left: '-10%'
      top: 30%
      width: 80%
image: local/card_background/bck_black.png