Impossible with Bluetooth, even with version 5.2.
Thing is, the number went up, but the audio spec didn't change a single bit. Bluetooth 5 cares a lot more about Low Energy applications: the core Bluetooth specification actually did not change much at all. What you're interested in is the Hands-Free Profile (HFP) and the Headset Profile (HSP) for Bluetooth, which is what's responsible for the low quality.
Just so you know, everything you read about Bluetooth 4.2 still applies for audio streaming for Bluetooth 5.0. Frankly, those who stated that BT5 offers superior quality don't know what they're talking about. The limitation is never the transfer speed, but the fact that the codecs simply don't use that much bandwidth to begin with. BT4 has a maximum transfer rate of up to 3 Mbps, BT5 6 Mbps; LDAC only goes up to 990 kbps. The only theoretical advantage is the fact that BT5 devices potentially have more range and therefore can keep an optimal connection going.