Trend Visualisation takes percentage difference, no option to get absolute difference

In trend visualization I have columns with actual percentage values, and I want to visualize the absolute difference between them as it will give me the correct percentage change. Instead I am getting percentage change of the percentages itself

Here, I want to see 2% difference in visualization, but it tries to get percentage difference which is not the correct answer

Diagnostic Info:

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    "run-mode": "prod",
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    "version": {
      "date": "2024-12-19",
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    "application-database": "postgres"
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