IEEE-format author line when one author is "Senior Member" and another is unaffiliated with IEEE
I would suggest asking the journal editor.  This seems more like a question of journal style than actual content, and the editor should be able to help with that.

I assume there is a tradition or convention that IEEE members are identified as such.  Otherwise, I don't know why you would include this information at all; I don't see why a reader would care.