Hi Andy,
I noticed that there are no replies to your question. Just wanted to confirm that there isn't a way to make the data tip values reflect only the brushed segment of a bar, for instance. As you know, the filter interaction reduces the bar to only include values for the selection in the first visualization, so the data tip values for a filtered bar chart would display the value you are interested in. If you have enough screen real estate, perhaps you could consider two target bar charts, one with the brush interaction and the other with the filter interaction.
Rick
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