Correct only one way. Now if you want to do some stuff that is only available on Echo, you can create a virtual switch/contact sensor on hubitat and expose it to Alexa. Then when that switch is active it can tell alexa to do something or if you want to set off a rule on HE you have the virtual switch as an activator for the rule on HE.
If you want TTS on Echo, get Echo Speaks from Hubitat package manager.
If you want to use ring, there is the unofficial ring integration in Hubitat Package Manager.
And there is a Nest API that a lot of people use. Read the following thread
