you can also write all the pans in one line using THEN like
&pan to zone 3 in 10 THEN cut to zone 2…
NARR
All you want to say
But it will be anyway depending on how fast reader reads and taps the screen so with long combination of camera movements and narrators it will always look bit differently to each reader.
If you want to 100% control when each speachbuble apears and disapears you would need to turn them to overlays.