Well, lossless over Bluetooth is a mess currently.
Only 1 codec is capable of that — aptX Lossless. Then, your transmitting device, phone / laptop / etc., needs to be compatible with it, and that's often not the case. Samsung and Apple don't support it.
I bought USB-C Bluetooth dongle that I use with my iPhone for that exact reason. It looks janky, but I think it's worth it.