Google cast media player, Text to Spleak needed!

Configuration
1

Hello,
I use duckdns.
I have the following config:

http:
  base_url: https://xxx.duckdns.org:8123
  ssl_certificate: /ssl/fullchain.pem
  ssl_key: /ssl/privkey.pem

tts:
  - platform: google_translate
    cache: true
    cache_dir: /tmp/tts
    time_memory: 300
    base_url: https://xxx.duckdns.org:8123
    service_name: google_say
    language: 'fr'

HA recognise my tv (and my android phone)
How can I use my tv as a text to speak device.
I read a lot of documents but don’t understand…

Many thanks for your help.
Best regards
Thierry