The graphs and gauges on the dashboards are used for simple visualizations.
More complex charts, or “better looking ones” are not present at current time.
Improved features for the chart are being worked on, but it might not align with your wishes.
In that case you’re free to start developing them yourselves. You can fork the GitHub repository,
make your own changes, and optionally contribute to the platform.
A guide on adding custom widgets can be found here.
An alternative could be, if you’re technical, tinker around with more advanced
third party visualization solutions like Grafana, and set it up manually using public APIs.
(think of using HTTP, MQTT etc)