Each ant needs its own set of data, it could be simple struct:
The Pawn can hold an array of those structs - that’s your colony.
In your save game object, create the same array for saving purposes:
As the colony develops and we get more ants, the Pawn adds and keeps them in an array. When it’s time to save the game, we save that struct in the game object.
Technically, you could use the List View as storage but it seems quite unnatural.
When it comes to loading, saving and updating save games, this explains it better than I ever could:
Saving and Loading Your Game | Unreal Engine 4.27 Documentation.