I would really appreciate finding a plugin for Volumio on this list to sync individual favorite radio stations across different devices:
Since Frontier Smart discontinued the Nuvola service for radio stations on October 31, 2024, you can store your individual favorites via https://airable.fm and these will then be made available for your devices.
Really confused on your ask.
The Nuvola service was for IE radio OEM boards from Frontier Smart.
I miss the relation with Volumio, unless I totally missed your ask.
You can setup radio stations in Volumio and when you have a premium account it will sync them across devices.
Or without a free account, you can do it manually. (copy/paste between devices)