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You could use two canvas, one for each chart.
You can hide the xAxis for the upper chart with options2.scales.xAxes[0].display = true
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And you must take care of the offset. Either both need offset or none because bar chart has offset and line chart not.
options2.scales.xAxes[0].offset = false
or the other way around, offset = true for the other chart
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Source:stackexchange.com