Hi there and welcome.
Unfortunately I do have some Innogy Smart Home (which does now go by the name Livisi) stuff as well. I don’t know if anything changed but last year I looked into that topic and the main problem was that the API is not accessible for everyone. Innogy seems very strict with providing access to that API and documentation and thererfore it seems that nothing has happened in terms of developers trying to integrate it.
Out of pure frustation I did an ugly workaround. Since both, Home Assistant and Innogy integrate with Philips Hue, I wrote automations that would set a certain dimming value for a light bulb. Within the innogy this exact dimming level would then trigger other actions.
As an example:
I tell Alexa “Good Night” which causes Home Assistant to set the light bulb in the living room to 22% and an Innogy scenario which is triggered by that bulb being at 22% dimming level reduces the temperature to 16°C in the living room.
I gotta say, this is definitely not 2020 and in the end I removed all that again. I decided to slowly replace that Innogy products due to all the s**t I had to go through with them and the lack of proper integration.
However, please let me now If you find other info. I’d be happy to be proven wrong!
added: I just allwed me to write innogy a mail and ask for API access and documentation. I will keep you posted