Histogram for attack and sustain of MIDI notes?

Can the attack and sustain (start/ending of a note) be randomized with the histogram functionality? I looking to make my midi playback more realistic. I’ve found MIDI pitch bend, but not attack or sustain.

Mac OS, Dorico 4 Elements and HSO symphonic library.

You can adjust the note on velocity with the histogram, but not the onset/offset position.

Wouldn’t this be a great feature? By clicking the offset in the histogram and applying the randomize function, the play back sounds much more realistic. I did it manually in a symphonic score (only first measures, because it is a lot of work).