Would it be possible to create an external legend for a graph as a separate object?
The legend should match the dynamic colors of the graph.
Not aware of a clean way of doing that, would be interested if someone has a creative solution.
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I'm afraid currently power bi doesn’t support change chart color based on a selected slicer value. As we aren’t able to set chart data color based on a measure with DAX. For your requirement, you can submit your idea here: https://ideas.powerbi.com.