Need help installing chart package

Hi,

I’m having trouble installing some chart package. Either one is fine
https://www.highcharts.com/demo/line-basic
or

or you can suggest one.

So it works when simply adding this lines
<script src=“https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.min.js”></script>
<script src=“https://code.highcharts.com/highcharts.js”></script>

but when

npm install xxx --save
require("xxx")
import("xxx")

I just cannot succed. (I previously installed jQuery and other packages with succes).

I played with the vendor folder but I’m, just not that qualified to work it out.

So the question is, how can I install chartjs or highcharts?

Thanks for help.