Any picture is saved in a square shape, I understand what you mean

You want a picture that is also circular in the final display, right? Then I am sorry to tell you You——-impossible (unless doing animation)

If you are making stickers and need to use an elliptical shape, you can do it in CDR (the version should not be too high), and then Just convert all the curves and save them. Generally, any processing factory that makes self-adhesive can use them