The G9 II will be supported in the next update of Nitro. The problem was that the G9 II and the GH6 use a new format for storing the camera data. As usual, Panasonic (like other camera companies) does not document the format or help 3rd parties decode them. It takes time to reverse engineer the format and add support.
Fortunately, I am not constrained by Apple’s camera release schedule because I have the ability to extend Apple’s RAW decoder (which is unique to Nitro and RAW Power).