does After Effects have an expression to trigger and align typewriter effect to typing sounds???

For setting the audio trigger to individual keystrokes, you might use markers. This would be a pain for long passages, (might be worth just recording someone typing the text you are showing), but fairly easy for a shorter passage.
See this short video: "Link Text Animation to Markers in After Effects" from UKramedia.

The trick with something like this is deriving the triggers. You could set up a time-remapped audio layer of a single typewriter keystroke and use a time remapping expression like this to use the Start property in the Typewriter effect's Range Selector to calculate the timing for the sound of each character typed:

T = thisComp.layer("Text");
txt = T.text.sourceText.value;
st = T.text.animator("Animator 1").selector("Range Selector 1").start;
n = txt.length;
delta = (st.key(2).time - st.key(1).time)/n;
if (time >= st.key(1).time && time <= st.key(2).time){
  (time - st.key(1).time)%delta;
}else{
  0
}

but the sounds will fire off at a very regular, mechanical-sounding rate (and spaces will sound the same as letters). But it might be a good place to start if you're up for a challenge.

https://aescripts.com/after-effects/audio/

Mylenium