Latest version of Edge browser Version 81.0.396.0 (Official build) canary (64-bit) has been shipped with another piece of puzzle for its Immersive Reading mode and now the new Edge browser almost has all of the features that the legacy version of Edge had in terms of Reading View mode/Immersive Reader mode, except for the Inline Definitions or Definitions inline.
Introducing: Line Focus
View the attached MP4 video file below for more info.
Update: on Version 81.0.411.0 (Official build) canary (64-bit) the Line Focus is now correctly scrolling down while Read Aloud is running and reading the sentences. previously the Line Focus would be stuck, waiting for user input to scroll down but now it is in sync with Read Aloud feature.