How would I automate that?
Nobody has a scene where location is spoken in a Sonos device for instance?
check the DNLA plugin from lolodomo which can send texttospeech to a DNLA device like smart TV or Sonos speaker
you can get the location from Iphone plugin and get it “said” through this I suppose
let me know if you get this working 
to make it simple, I use ALTUI plugin and incorporated a “SayTTS” action on the ALTUI device.
it searches for your sonos device and uses the Voice RSS API on the web to do text to speech and requires you register a Key and store it in ALTUI settings.
then I personally use scenes ( or ALTUI workflow ) and call this action
on ALTUI device (#nnn)
Service:urn:upnp-org:serviceId:altui1
Action: SayTTS
Parameters : [{“name”:“newMessage”,“value”:“my message goes here”},{“name”:“newVolume”,“value”:“40”},{“name”:“newGroupDevices”,“value”:“”}]