Not sure if this is what you were looking for, but you can generate SVG graphics and render those using APL VectorGraphic primitives.
You will have to build a custom skill that, when invoked, can pull the data for your metrics, and generate the APL to render the graphs.
Alternatively, if you have a different server-side rendering API for the metrics that can rasterize, you can produce a PNG and render that on the Echo Show.
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