Hello all,
There is solution for Sonos TTS for both HC2 and HC3 that requires installation of https://github.com/jishi/node-sonos-http-api on e.g. Raspberry PI, but it gives full control over your Sonos speakers including TTS notifications.
For HC2 there is Sonos API Player VD Standalone that can be downloaded from Fibaro Forum download section: https://forum.fibaro.com/files/file/417-sonos-api-player-vd-standalone/
For HC3 family there is Sonos API Player QA Standalone that can be downloaded from Fibaro Forum download section: https://forum.fibaro.com/files/file/415-sonos-api-player-qa-standalone/
Both packages also contain User manual for easy setup and isntructions how to use them from other VD, QA and scenes. Both solutions are tested with the latest Sonos OS S2 version 16.2 (build 79.0-52294) and hardware versions 1.8.1.3-2.0, 1.8.3.7-22, 1.20.1.6-2.2, 1.21.1.8.-2.2 and Roam 1.33.1.10-2-13
Both solutions support Sonos favorites for unlimited number of radio stations and playlists, TTS notifications etc.