Hey @user9NUxgJD7v9, I hope you're doing well.
Great question! Though I do not have confirmation nor specifics, I expect that Samsung will indeed enable this and push it out to the S21 (including unlocked devices.) I for one also hope this comes soon as I do carry 2 phones around (and sometimes 3) and this would eliminate the extra clutter.
I will let you know if I see anything to help with your question.
If you've found my post to be helpful, please like the post. If my response resolved your issue, please press the "✓ Accept as Solution" button.