to be clear, im a 'fight the genre' guy :) but for fun, i'll join in the game here :)

....starting with her first stellar record "Blame it On Me" in the 90s (which was one of my faves back then, and STILL sounds as refreshing today as it did then) id say, yeah, Alana Davis should be added to this list too...

also another artist who first broke out in the 90s, Dionne Farris...add her too.

and as you mentioned, Meshell too of course, some of her stuff surely would fit into that 'soft rock' genre .... well, you know, if one HAS to do the 'genre thing' that is ;)