Grafana IFrame Https doesn't work in App

Hi, I’m using Homeassistant on a Virtual Server and get to it via Browser or via App over NabuCasa. On another server I have InfluxD with Grafana and it works fine. Now I wanted to have Grafan Panels in my Lovelace. This works fine for Web, but in the app I get an error that it isn’t possible to show http-iFrames when connected with https.
So I set a selfsigned certificate on grafana and https works fine. But if I try to connect by app I get an SSL issue and the app isn’t loading in general.
What kind of certificate do I need. Is there a good tutorial how to solve this issue?
Thanks for your help.

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I have the same problem and no solution yet