A couple more things to add:
First, when it comes to these jazzy, extended chords that are made up of more than three notes, it's perfectly acceptable (and, in practice, quite common) to simply drop one of the notes, with the 5th usually being the best candidate. After all, that's what the 7th and Dim7 chord buttons do on most accordions.
Which means (among other things) that you can usually get away with simply playing a dim chord in place of a minor 6 chord. No urgent need to add in the minor chord button, since all that would add is the least-useful note of the chord... the 5th. Nice to have? Sure. Necessary? Nope.
Second, there seems to be a tendency among accordionists to think of the RH as "the thing that plays the melody" and the LH as "the thing that fulfills
all the harmonic requirements of the piece". This is probably because that's how all the music you learn when you start out is arranged.
But in a lead sheet like the example above, that chord symbol on top of the measure is a indicator of the
overall general harmony of the music at that point.
How you create that harmony is entirely up to you.
- Want to play all of it in the LH? Go for it!
- Want to divvy it up between the left and right? That works too.
- Want to strip it down and simplify? It's jazz (isn't it?), so why not? Just play regular Cm, Fm, etc. chords. I won't stop you!
- Want to dress it up even more than notated? Maybe play those Cm7 chords as Cm9? Knock yourself out!
(Heck, I find that I often do all of the above at different points in a song.)