How to delete lines in Chart widget

[GerardMartin]

I am using chart widget to generate line charts. It is running fine, but my client wants to be simple so I follow this useful post that solve most of client requirements (Thanks @RobertScheitlin__GISP )

 https://community.esri.com/t5/web-appbuilder-custom-widgets/chart-widget-customization/m-p/841703#M9...

Now, I have to remove default lines in chart and only show points (vertexs).

The file attached shows in the first image the line chart that I have, but client wants charts like second image:  chart showing a scatter plot for more that one point selected.

I have just seen in OperationsDashboards help:  https://doc.arcgis.com/en/dashboards/get-started/serial-chart.htm  that it is possible to create a chart with multiple lines. 

Is it possible to do with Chart Widget in Web AppBuilder ? Or, is it possible to use a Dashboard widget as a WebAppBuilder custom widget ?

Please suggest me how can I do. Thank you in advance !

[GerardMartin]

In case it helps someone, I have finally removed default lines in Chart widget setting width style to 0 in config.json file.

I'm still working to show multiple point series in Chart, but I guess that it is not possible because there is this property defined in widget.js:    noMoreThanOneChartClassName: "no-more-than-one-chart",

I'm not a JS developer, so if someone could confirm this and give some help in this matter it would be of great help. Thank you!