To animate a line graph in PowerPoint, you need to open the slide, draw the Graph add the labels and then animate the graph as explained here.

Start the PowerPoint application and use the "File" menu to open the presentation containing the graph to which you wish to add the callout.

How do I add data labels to Sunburst chart? When you create a Sunburst Chart in PowerPoint, the labels will add automatically to the chart; if there are no labels in the chart, you can right-click ...