How do I get a list of existing Level Names?

I know I can setup a pre-populated list of level names and use that for level selection.

But I would eventually like to allow players to create their own levels and add them to my game.
Which means I will need to have a way of searching for those levels and adding them to the selection process.

Is there a way to do this?

After Packaging the game, where are levels stored?
Is there a .ini config somewhere that lists them?

Yes… as I mentioned in the opening post, I already know that.

Im asking how to support adding levels to the project AFTER it has been packaged.

IE: How to get a list of level names from outside of the editor, like from a config/.ini file, and allow adding to the list later by users.