How to play a Gb9 chord on Accordion

AKA: Gb7(add9), Gb7/9, Gb9, Gb Dominant 9, Gb Dominant ninth, Gb Ninth

Notes:

G♭, B♭, D♭, F♭, A♭
(G♭, B♭, D♭, E, A♭)

Intervals:

R, 3°, 5°, m7°, 9°

Left hand:

G♭ + G♭M + D♭m
(F# + F#M + C#m)

Fingering:

4 + 3 + 2