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Other label positions - middle horizontal and middle vertical - ar available for Bar charts (type “column”) only.
All charts, including positions for labels, are created dynamically, and calculate the positions for labels in other positions other than the top (and the middle for bars) are too complex, therefore, they are not available to choose.
In your case, you may want to consider either displaying only values for total or switching to stacked bars to avoid overlapping labels.
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