You are asking for third party support for some device no one has and is described in a German language post.
What this has to do with a Feature request, I have no idea.
Nor do I understand your device or what you are trying to do. Youlatched onto another new users attempt at an MQTT command that may ot may not do what you thionk you want to do.
I think the reason you are not getting the help you need is that no one understands what equipment you have what you have tried, and what you want to do with it.
Are you using an ESP device and want to have MQTT discovery pull in the light component? That’s my best guess. And that’s not going to happen with that MQTT topic. The device itself has to send a topic to the correct path so HA sees it and in the schema listed above in order for you to get the light features HA has available. The only way around that is use an integration (custom or otherwise) that will translate what the device wants to the data format that HA wants.
Now with a lot of patience, you could pull the data into HA as is, translate it, use MQTT Discovery topics to create HA entities, and use that conversion autmation to make the lights work. It is not impossible, but is very specific and something you have to do on your own at least to the point you have something you can ask questions about.
We are volunteers, not staff, not official support people. If you have a question or want help, we expect you to have an idea on what is going on and have a bunch of the easy problems solved and be halfway towards your goal. This helps us help you.