Best practice for referencing SpriteFrames in AutoAtlas?

I have a group of Sprites that will be compiled into an Auto Atlas at build, and I have placed a reference to the .pac file in my code. I would like to reference the each sprite individually though, for example: atlas.getSpriteFrames()[1]

AutoAtlas offers a .getSpriteFrames(), but because atlases are not built during preview, it turns up empty.

What is the best practice for retrieving a SpriteFrame from an AutoAtlas that is able to run under preview mode?

Should I ignore the AutoAtlas and

1. use loader/loadRes to load the sprites individually?
   OR
2. set up an array of SpriteFrames and populate with references to individual sprites?

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