MacOS Seirra version 10.12.6 ( 16G2128 )
I'm use from this link https://osxfuse.github.io
download the software
i don't know why can not automatic mount in finder, so we must use CLI.
( edit : i think some of diskutils not working well with osxfuse )
sudo ext4fuse -o allow_other /dev/disk2s1 /Volumes/hdd/
and you only can read the files
source : https://hackmylinux.com/2018/02/18/how-to-mount-and-read-a-linux-partition-on-a-mac-ext2-ext3-ext4/