Apologies if this is a basic question but I have not been able to figure this out in a long time despite having looked online at the docs and forums. I can automate aspects of a whole MIDI clip which affects all the notes together. However, how do I change the volume of each note over time within the same MIDI clip? For example, in the below clip for a string inst, each note starts at a certain volume that I want but when I layer the next note on top of the previous one, I want the volume of the previous note to gradually decrease or evolve over time.

So far, I have been typically doing this by splitting each note in different tracks (since in real life they would be individual players in any case) but I was wondering if it was possible to do this within a single clip to speed up the workflow. Would appreciate any inputs on this.
EDIT:
To clarify, the VST I am using for this case does not support MPE so I cannot use the note expression editor to do this. I guess that is the way to do this and if the device does not support it, then I have to split it into individual tracks for each MIDI note?
Ableton 11.3.25
MacOS
Cheers,