This endpoint retrieves funnel chart data for a specific widget identified by the dashboardId and widgetId.
Filters can be applied via query parameters. The response will include various HTTP status codes based on the result:
200 OK: If the chart data is successfully retrieved.
400 BadRequest: If the request is malformed.
404 NotFound: If the specified dashboard or widget is not found.
500 InternalServerError: If an internal server error occurs.