Show preview in image when setting the max num of colors when exporting to GIF? Gimp

Is there a way to see a preview of what is going to be the result of the max numbers of colors when you are setting them in the gif indexed options ?

jpeg has a SHOW IN PREVIEW option but gif dont , is a waste of time to :

try settings
click ok to those hundreds of dialogs after saving
checking the image
if you dont like the result

Do it all over again.

Image -> Mode -> Indexed -> Set it up the way you want and click Convert. If you don’t like it undo and redo until you do.