Invoke dialogflow on a GA enabled device

Any Dialogflow gurus around?

Thus far I can set up DF intents and have them fulfilled by the HA webhook and a HA intent script. I can also invoke an intent via the google api without the need for human input.

Here’s where i get stuck - I need HA to trigger the intent AND specify a google home device (mini, hub etc) to assign the subsequent interaction to. Example: a person activates a HA motion sensor then HA launches an intent on the google home mini in this room.

Has anyone been able to implement this?