Secondary Steam storage on GNU/Linux [guide]

[redsfyre]

Its a bit odd and i couldn't find any existing issue or reference (tried to search, no luck).

I have a secondary disk to download my games, which is mounted to /opt/games
My workshop contents also located in that disk: /opt/games/SteamLibrary/steamapps/workshop/content

linux-wallpaperengine couldn't find that directory, so I simply bind the correct path to my ~/.steam/steam/steamapps/workshop/content via;
sudo mount --bind /opt/games/SteamLibrary/steamapps/workshop/content /home/$USER/.steam/steam/steamapps/workshop/content

Careful, this will hide your existing contents on the first disk, you can access them again after unbind the second disk;
sudo umount /home/$USER/.steam/steam/steamapps/workshop/content

I am creating this issue to help people who encounters the same problem, and/or people can teach me a proper way to solve this. (I am not an actual developer so unable to find any parameter to point contents dir, like as in --assets-dir)