Custom Inspector: For every new element in one array create a brand new array?

So, I have created the functionality for adding a new array every time a user developer adds a new element to their inspector. However, I do not know how to do it dynamically. Right now I'm hardcoding the arrays and its a very tedious and not scalable way to approach this.

I tried using List and adding a new array in there but those arrays are not serializable so they cannot be added to the inspector from what I've seen. Is there a way to dynamically create new arrays, technically at runtime, and serialize them to show up in the inspector through a custom editor script?