How to achieve connecting points from different series in Highcharts - javascript

So this is pretty much what I'm trying to achieve:
Each bar would be a series, and each serie would have associated a point within the metrics.
The issue here is that I cannot figure out how to join those dots with the line, apparently for being separated series.
Here we have a similar example, but only with one series:
https://www.highcharts.com/demo/combo-dual-axes
Hope anyone can help out here.
Many thanks and have a nice day!

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I have some ideas of how I could do this, but they all seem like kind of indirect solutions. I could implement the benchmark lines as another column series, and style them so that only the top of the column shows, or as a scatter series where the "points" are actually lines, but I don't know if either of those are possible and they sound like a complicated way to do something simple. Hopefully I'm just missing an obvious feature of Highcharts.
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http://www.highcharts.com/demo/column-basic
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Things I've tried:
creating two completely separate charts and stacking them.
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this won't work because it "stacks" or groups data, I want to literally have two separate series that might not have anything in common with each other.
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