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If you are using a dashboard to show your chart, there are many ways you can do this. You can replace your legend with text boxes that shows the parameters value and blank containers that represent the color box. You can also use sheets with shapes parameters values as your text labels.
If you can share your workbook, I can try and give a demo.
This simplest solution does seem to be floating text boxes that show your parameter values over the top of the existing Metric 1 and 2 text. You'll need to make sure your background color is white so as to block the text underneath.