This alfred workflow will list avaliable iTerm2 arrangements and let you select one to restore.

iterm2: Build 3.4.15 (not tested on other versions but myght work)

And the following python libraries:

pip3 install iterm2
pip3 install pyobjc

This workfllow will use the python from iterm2 on ~/Library/ApplicationSupport/iTerm2/Scripts/get_window_arrangements/iterm2env/versions/3.8.6/bin/python3

Just type iTermA on alfred and it will:

• Launch iterm2 if its closed
• List the avaliable window arrangements
• Restore the selected window arrangement

Check the releases page to download it.