Thanks for that info - I wasn't aware of HWA beforehand.
Like Sony's LDAC, HWA is a BT lossless codec proposed by Huawei (though I believe it was originally developed by a Taiwan's software company, which Huawei acquired the right from). A few of the Chinese DAPs makers already adopted it onto the newer DAP, including FiiO, Hifiman and iBasso, as well as some of Huawei's newer smartphones. You can check out the list of companies that have pledged to support it here: https://www.hwa-lhdc.org/. My smartphone is a Sony Xperia so LDAC is already enabled when used with BTR3 - that allows me to switch between LDAC (Xperia's default) and HWA (via FiiO app), which the difference is much more obvious than changing cable on some headphone even though both claimed to be lossless. HWA just sounds fuller / less compressed than LDAC most of the time.