Export items individually

[rich2005]

Another way using g'mic plugin. No need to flatten anything.

ref: https://i.imgur.com/0j0E54G.jpg
top to bottom
1) g'mic extract objects for the text layer (if you have a text layer, otherwise just a layer with individual shapes) Output to a new image
2) The new image showing a couple of layers
3) An individual emoji

Plenty of scripts/plugins that will export layers as individual files.