Is it possible to export Animoji to a file and preserve the transparent, alpha layer background?

I've created a Animoji (video version of an emoji) on my iPhone and I noticed that it appears to have a transparent, alpha background. I would like to save this Animoji with its transparent background and transfer it to my Mac for further use. I've seen another post here that opening and saving it in Quicktime on a mac makes it possible to keep the transparency, but it turned to alpha channel into a static black background after saving.