How to create DLC for Quest 2 or Android [Please help]

How to create DLS for Quest 2 or Android. If possible in more detail.
At the moment, it was possible to create pak files, but how can I make sure that when installing the application, these add-ons are installed if they are purchased? I looked at a lot of documentation / information and I can’t do it in any way. I just need to add a couple of objects to the project logic through DLС
I hope very much for your help :smiling_face_with_tear: