Ahh sorry I misunderstood what you were asking. At the moment there is not an internal way to video record MiniMeters. I would like to get that added in the future.
What I personally do is use the native screen capture on macOS with CMD-Shift-5 and then just add the audio later in an editor. But OBS captures desktop audio on macOS if you're using macOS Ventura or later which might be the most straightforward option.