Sure.
- find the directory where your plex data lives (https://support.plex.tv/articles/202915258-where-is-the-plex-media-server-data-directory-located/)
- Inside this there’s a
Plex Media Serverdir where Logs/Metadat/Cache etc live; create a dir namedProfileshere. - Place the Chromecast.xml file shared above in there, or create your on if you know what your doing.
Profiles placed in the “application support” or “plex data dir” always override the ones in the install dir that we ship.
This in very handy but do use with care since you can also break Playback. I.E. the profile above is confirmed by others users to work with the Chromecast Ultra, but might break playback for all other Cast devices.