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I fear that's not possible. 44.1khz/16bit(cd quality) for stereo out and mono in required over 2.1mbps bandwidth. Best bluetooth codecs nowadays can achieve an absolute maximum of 1.2mbps over very short distances.
You should check new Sennheiser wireless systems. www.sennheiser.com/en-de/catalog/products/wireless-systems/profile-wireless-2-channel-set/profile-wireless-2-channel-set-700266
I'd be fine with a usb-c receiver plugged into the phone.
The important thing I'm missing with existing solutions like sennheiser is that there's no two way audio support needed for calls.