I use:
- service: media_player.play_media
entity_id: media_player.office
data:
media_content_id: http://icepe5.infomaniak.ch/jazzblues-high.mp3
media_content_type: audio/mp4
where “office” is the name of my Google Home.
You can get the stream URL by playing the TuneIn station in your browser, inspecting elements on the page, and then searching for “jp_audio” in the source code on the elements tab.