Chart data (data1, data2, where clause, etc.) */ public function get_chart_data(): array; /** * Get the chart labels. * * @return array Array of translated label strings */ public function get_chart_labels(): array; /** * Get the chart type. * * @return string Chart type (line, bar, pie, etc.) */ public function get_chart_type(): string; /** * Get chart-specific options. * * @return array Chart options */ public function get_chart_options(): array; }