> can't migrate stars/icons for emails.

(1) Create s label for starred emails, eg "Star-struck". A Unicode star would do if you like it literal.

(2) In gmail, search for "is:starred", mark all on the page, then "mark all matching emails".

(3) Drop the "Star-struck" tag on them. Now you can migrate it as a normal tag.

Thanks, but I am using multiple variants of the star icons to indicate various states. I know I can manually label and migrate things, it's just not practical for me.