This is much easier than you'd imagine! Keep the measures you've got on the columns shelf, but remove Category from the Rows shelf and instead bring it onto the Color button in the Marks card. This will automatically divide that one bar into 3 different segments, each having its own color. That should do it!
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You can start with a dual axis chart with 2 measures:
then add a reference line with the third one:
Or you can display only the measure values filtered by measure names (of the measures you want to display). Then use the size and color mark card to distinguish them:
Hope this helps,