@msingh,
Single legend to multiple charts is not available, as of now. However you can achieve the same by disabling legends for all the charts except the one at the bottom / last chart and handle hiding / unhiding of dataSeries of all charts from the shown legend. Please take a look at this JSFiddle for a demo. Same code works fine even in Angular, React and other frameworks.
If this doesn’t fulfill your requirement, kindly share JSFiddle with your use-case with us, so that we can look into code, understand the scenario better and help you out.
—
Vishwas R
Team CanvasJS