Sync light / dark choice when signing up on a new site

I was just wondering, let’s say we are about to join 100 separate Discourse sites.
Will there someday be some technology available to allow us to automatically sync the light / dark mode choice with, let’s say our browser, or let’s say our cell phone, or computer?
Currently for each site we join, we need to go into Preferences there and adjust it manually.

Discuss this on our forum.