How to Import 3D assets into a compiled app?



I want to create something using UE4/UE5 but I’m not sure if what I want is possible (out of the box). I know this question has been asked before, but all I found was from really long ago and UE has come a long way since then.

[I need help with]

So, I want to make it so that my already compiled project can import (with a simple drag-n-drop for example) 3D objects (OBJ< FBX< GLTF, etc.) as static meshes to be used inside. There has to be a way, right?

Thanks in advance!