Download the mod from the following link: https://pocketcitygame.com/steam-mod.html
To activate the mod, open the settings menu during gameplay and scroll to the mod section. Click on the Add New Mod button and select the folder the mod was extracted to. Activate the mod using the dropdown in the Mod List. Enjoy!
I was hoping to set up a Workshop item for this, but it turns out the Steam Workshop is quite complicated to work with and requires more API integration. In the meantime, I've simply uploaded this as a zip file which you can download and use :)