How can I do this in Unity?

I'm currently programming a survival game in Unity and would like to create a mods folder like in Minecraft-Forge with an api for my game so that you can e.g. Can add new objects. Is that possible? And if so, how. (Multiplayer is not planned for now.)

It'll probably help you https://forum.unity.com/threads/making-a-moddable-game.312490/

Or do it like this at the start of the game you go through the eg addons folder and load everything in there but i don't know how exactly that works in unity