found it!
These commands seem to work and address individual subplots only:
fig.update_yaxes(showticklabels=False, row=2, col=2)
fig.update_yaxes(showticklabels=True, row=2, col=3)
fig.update_yaxes(showticklabels=False, row=2, col=4)
fig.update_yaxes(showticklabels=False, row=2, col=5) etc …
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