Hi Marco,
We have used ajax request to get the data for the chart, currently in stackblitz they have prevented local and the online ajax request access, hence the sample is not working in stackblitz. We have already reported this issue to the stackblitz team. Also, as of now workaround solution is not possible for this. Please find the github ticket in below.
Please let me know, if you have any queries.
Regards,
Baby.