DAC correction support is added to Laiv Micro DAC only, not the Laiv DAC yet at least shown on the HQplayer official website.
The correction profile is selectable when the non-micro Harmony is connected and it's also cited on page 20 of their PDF Manual (found in the application folder after installation) alongside the micro Harmony. The May also shares the correction profile with the Spring, so my assumption is that it's applicable across the range as it sounded fine to my ears.
Feel free to message Jussi to confirm whether the Laiv correction profile universally applies to all their DACs and test for yourself.
I also highly recommend installing VB Audio's HiFi-Cable since it enables streaming from additional platforms that aren't supported by HQPlayer:
VB-Audio Hi-Fi Cable