Your comment led me to the Insta360 device that makes it easy to take selfies with the main camera:

https://www.theverge.com/tech/907670/insta360-snap-usb-c-mag...

Second screen: provided by USB-C screencast and accessibility settings for to support touch. Image of device: https://platform.theverge.com/wp-content/uploads/sites/2/202...