Cannot add multiple colours to the line chart

### Expected behavior

Should be able to give two colors for a single line graph or join multiple line graphs into one

### Current behavior

I want to add two different colours for the line graph. I tried passing an array of colours to borderColor but it is not working. I tried creating 2 lines but then those lines are showing separately.

Link for both the code pen

https://codepen.io/dolly-c/pen/qBJboXa

https://codepen.io/dolly-c/pen/poxgLeY

### Reproducible sample

https://codepen.io/dolly-c/pen/poxgLeY,

### Optional extra steps/info to reproduce

_No response_

### Possible solution

_No response_

### Context

_No response_

### chart.js version

v4.2.1

### Browser name and version

_No response_

### Link to your project

_No response_