Provide an option to display a chart legend for pie and cartesian series. Also provide an option to change the legend position to be left, top, bottom, right position to the chart

Provide an option to display a chart title and align it to top left, right and center and bottom left, right and center

Provide cross hair feature similar to kendo -> https://www.telerik.com/kendo-jquery-ui/documentation/api/javascript/dataviz/ui/chart/configuration/axisdefaults.crosshair  

the requirement is exactly what you have on the kendo chart crosshair where the horizontal line follows the mouse while the vertical line locks to the nearest datapoint. 

provide tooltip on hover the pie donut data point, also on selection to display the tooltip - image is attached

provide tooltip/trackball on hover data point and when pressing the point- check the attached image. 

for example point markers on line, area, scatter line and spline series

option to have gradient and color change for the new charts