Some users in the Windows Insider Programme now have the ability to mirror their Android phone screen on their desktop via the Your Phone app.
The feature requires that the PC has support for Bluetooth with Low energy Peripheral mode in order to connect to phones, more details on how to check if a PC supports this feature can be found on this Microsoft community forum post.
The screen mirroring feature is only available to Android phones running Android 7.0 or newer, but only the Samsung Galaxy S8, S8+, S9 and S9+ can be used during the testing period.
According to the Microsoft blog post, the feature is gradually rolling out to Insiders that are on Insider Preview build 18356 (19H1). Users running Windows 10 builds 1803 or newer will receive the feature at a later time.