That link may show the current state of Musl on Alpine, but Musl can be built with https://en.wikipedia.org/wiki/Mimalloc

https://github.com/microsoft/mimalloc

as https://en.wikipedia.org/wiki/Chimera_Linux / https://chimera-linux.org/ does.

Which btw. can be done in Alpine, too:

https://wiki.alpinelinux.org/wiki/Mimalloc