Use dotted lines to connect some points on a line chart

Excuse me, how can I use dotted lines to connect some points on a line chart? Assuming this polyline has 6 points, the first four points are lines, and the last two points are dashed lines

No file or test is named. Start at the line-chart polyline rendering entry point and trace how points are connected; completion should support a six-point series with the first four connections solid and the final two dotted or dashed.

Written by the indexing model from the issue text.