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The position x (either with or without offset) for the Line points are calculated only on the basis of dataset length
var includeOffset = (labels.length === 1 || dataset.data.length === 1) || me.chart.isCombo;
x = xScale.getPixelForValue(typeof value === 'object' ? value : NaN, index, datasetIndex, includeOffset);
So the includeOffset decides the position of the line points to be in middle or left for the region and no way to configure it.
Source:stackexchange.com