Thanks for your idea.
I think grafana is (at the moment) way more powerful and beautiful and i can tweak a lot of the visuals.
Also the OH3 graphs seem to not work well with my InfluxDB1 (which i cant upgrade because of 32bit: OH3 Graph of Switch item)
In the latest OH3 RC2 i’ve seen they added a webview widget.
I will try this now.