The best you can do these days while keeping to the standard is to use mSBC codec which at least does bidirectional 16bit. It's not too common unfortunately. At least on Linux you can force the codec you want with pipewire. On Mac you just get whatever Apple decides you're allowed.
mSBC is kind of a hack, though. It pushes Bluetooth beyond its specifications and often works, but in my experience it also often causes dropped audio in less than ideal situations (i.e. walking with a Bluetooth headset on).
mSBC is worth a try if you haven't already tried it, but it's not a real solution. Bluetooth LE Audio does provide a fix, but real hardware that supports it is hard to come by.
