How to play a Gb9/11 chord on Accordion

AKA: Gb7/9/11, Gb9(11), Gb9/11, Gb Dominant 11th, Gb Dominant 7th/9th/11th, Gb Dominant eleventh, Gb Dominant ninth eleventh, Gb Dominant seventh ninth eleventh

Notes:

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

Intervals:

R, 3°, 5°, m7°, 9°, 11°

Left hand:

G♭ + F♭M
(F# + EM)

or

G♭ + G♭M + F♭M
(F# + F#M + EM)

Fingering:

2 + 4

or

3 + 2 + 4