I hope the link above link works. Scroll down and watch the Diamond A Exercises and watch it.
I am not ready for that yet, but it lets you know that playing high notes passively us possible. I am still working in Allegro level C# singing C Exercises and D Exercises.
I’m working to play these notes passively. I find starting from C below the staff (stave) to D in the staff and playing as slurred scales, I can. Playing D first note out, I play active support. I have to work on it.
I don’t know if this has been any help, but keep practicing and learning and we will get there.