Hi, I wonder if there is any peak indicator for either the onboard mikes or the wireless. Like the top bar turning red or so. I cannot find that and I terribly miss that.

Not as far as I know.  From my observations, particularly when making a video of a jazz club event, the Pocket 2 uses a non-switchable limter to prevent overloads / clipping, which does its job pretty well.  But for music, that's best avoided, and the lowest sensitivity is likely to produce the best results, so that the limiter isn't activated.  In general I would recommend simply taking note of the results you get on different material, and then set the level accordingly next time.

Makes sense, thanks. For my purpose (vlogging) actually quite OK. I have a Zoom for better quality with me.

Hi, bikelike. Thanks for reaching out! Sorry, but the DJI Pocket 2 doesn't support this function.