I used to learn songs from piano tutorials like these, too, and had to do the manual work of annotating keys and chords. It’s nice to see a very real pain point being eliminated — maybe I’ll even find some new songs to learn :)
While neat from a technical perspective, this seems like a solution in search of a problem.
EDIT: On the other hand, a cursory search did not find any midi/piano sheet music for "Hi Nanna: Samayama" - so maybe only having this "falling note video" is more common for certain music.
The current output isn't a particular format. It's purely text output that looks like this.
1:01 -----|A1--B1|----A3--A4|
1:03 -----|A1--B1|--A3--A4|---B2|
If you had a way to copy and paste that as a string of notes and visualize in a loop or some-how that might work. You'd have to figure out how long a note was pressed etc, so it may require some extra logic.