You need to use a data resource to retrieve the list of events to display in the timeline component. Then create your own data resource to transform the data into the format expected by the component.
Check the component's doc here: https://developer.servicenow.com/dev.do#!/reference/now-experience/sandiego/now-components/sn-component-timeline/overview
If you elaborate on the source and type of events you need to display, that will help in helping you.
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