Dont guarantee this will work as I dont have mac to test this myself but this is what I found on reddit. Even if it works you will have to do this again every update.

First create a mods folder under ~/Library/Application Support/Steam/steamapps/common/XCOM 2/XCOM2Data/xcomgame, so it looks like this: ~/Library/Application Support/Steam/steamapps/common/XCOM 2/XCOM2Data/xcomgame/mods

Next, navigate to ~/Library/Application Support/Steam/Steam Apps/workshop/content/268500
Any mods you have installed will be in here in numbered folders. Copy all of them and paste them into the mods folder you just created.

If you relaunch the game you should now see two copies of all the mods, one set with the workshop logo next to them and one without. Enabling the set without the workshop logo should work.