Render A Chart To Png From JSON API
Render a chart to PNG from JSON: bar, line, pie, doughnut, scatter, radar, polarArea or bubble. Pass a full Chart.js config (config) or the shortcut type + labels + datasets [{label, data}] + title. Rendered with Chart.js in headless Chromium, no external requests. Params: config or type/labels/datasets, title, width and height (100 to 2000 px, default 800x500), background (CSS color, default white). Returns image_base64 (PNG).
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