Google Home Mini and Amazon Echo Dot for TTS

Configuration
1

Can I use these speakers for Text to Speech without need to integrate Alexa or G. Assistant to HA?

2

for alexa https://www.theverge.com/circuitbreaker/2018/4/5/17202952/amazon-alexa-announcements-broadcast-every-echo

for google https://support.google.com/googlehome/answer/7531913?co=GENIE.Platform%3DAndroid&hl=en