Yep!
- The dlc files are in the Program Files > Steam > steamapps > common > Our Life Beginnings And Always > Game
- Send those files to your Mac
- Copy DLC the files, they should .rpa in the title
- On your Mac, after you've downloaded macOS ver of Our Life Beginnings And Always,
- Go on your Finder and open Downloads > right click on Our Life Beginnings And Always > show package contents > resources > autorun > game
- Paste those files into the game file.
If you still need help, dm me on discord, my username is ryeisacatslave :)