Hi Markus. What would you like to annotate? Where would you like these to be visible? Can you give us details of your scenario please?Ned commented
David has described the need well, and I agree the Tableau annotation features are a good model. The "Enlighten Data Story" custom visual (in PowerBI marketplace) provides some of the features (combining static text and measures), but the need is to have something like this embedded in other visuals and linked to data points with relative positioning.
Would you recommend starting a new thread, since the original poster didn't provide any detail?
Checking with Will Thompson and moving status to backlog