R&B, Neo Soul chords are not the easiest chord to compose. Especially as they mainly use non-diatonic chords.
Here is a neat Kontakt plugin which allows you to play R&B chord instantly by selecting one of the many progressions, and playing the base key only.
You can even change keys, octaves, and also the types of chords !!

SCM2 - Soulful Keys - Neo Soul and R&B Production