Generate a chart URL using QuickChart.io. Supports multiple chart types: bar, line, pie, doughnut, radar, polarArea, scatter, bubble, radialGauge, speedometer. Customizable with labels, datasets, colors, and additional options. Returns a URL to the generated chart.
download_chart
Download a chart image to a local file. Takes chart configuration and output path as parameters. Saves the chart image to the specified location.