Use custom asset file and folder

Hello, I am new in Unity and i want to ask something.

Is it possible to load an image from disk / array of byte then attach it to SpriteRenderer of a GameObject and then get rid the _Data folder? ( and embed the managed .dll into single executable)?

or if its not possible, can i rename the _Data folder?

The short answer is no, while you can hide the folder, you can not rename/delete it