You don’t need to use a pick. But if you prefer finger-style it helps to develop the proper chops. Guitar Player magazine offers advice.
(Psst… here’s another approach) Molly Tuttle explains how to build coordination on a three-string plectrum pattern in what is called “backward cross-picking.” Find it in Guitar World.
We’re not back into in-person studio lessons yet. In Jazz Guitar Today, Musicians Institute instructor, Dean Brown, explains how he’s adapted his teaching in the meanwhile.