Volumio 3 - web radio - album covers

Where in Volumio (on SSH) is the file with the list of webstations added by the user. How to edit it to add accepting album covers of the selected radio.

There is a way to do it for favorite web radios.
But be aware this will break the OTA updates functionality.
If you decide to go this way, make sure to back-up the file and place it back if you wan to do a OTA to the next Volumio release.