Chromecast and HLS Streaming from Volumio

Hi all

Become a recent Premium subscriber and I am trying to figure out what is the quality of the HLS stream to a Chromecast Audio from Volumio (running on x86 but soon to switch to a RPi 5)?

The source material from the NAS is FLAC 24/96, which the CC Audio is capable of. However is Volumio streaming at this resolution or it is compressing it to AAC etc?

Many thanks and sorry if this has been answered (I did look and find nothing since the 3.3 announcement).