Method for rendering a saved Exabel chart as an image.

The chart is referenced by its resource name, which can be copied from the chart's URL in the Exabel web app. The rendered image matches the chart as it appears in the app, using the chart's own saved signals, entities, transforms and appearance settings.

Provide entities to render the saved chart for a different set of entities than the ones it was saved with. This turns a chart into a reusable template: one saved chart can be rendered for any number of companies without editing it.

If the chart was saved with a relative time range, such as the last twelve months, that range is resolved when the request is made, not when the chart was saved. Two requests made on different days therefore return different windows. Provide timeRange to render a fixed, absolute window instead.

Charts that live in a dashboard rather than in the library can also be rendered, by naming the widget that holds them instead of the chart. Use the Management API's "List dashboard widgets" method to find those names.

Only time series charts are currently supported. Requests for other chart types, such as bar, column, pie, cohort and seasonality charts, are rejected with an error.