Filoni was a big reason why both The Clone Wars and Rebels went from youth-oriented fare to must-watch canon, and Varnado was very thankful for the endless guidance and information that he provided where Koska was concerned.
So it wouldn’t be outside the realm of possibility for it to happen.
It’s almost 100% certain that storytelling mastermind Dave Filoni, who also serves as a writer and executive producer on The Mandalorian, would be the creative mind behind whatever future Star Wars animated series would theoretically bring Mercedes Varnado’s Koska Reeves back into the fold.