Node-red-contrib-googlehome: where does query come from?

I have integrated and used node-red-contrib-googlehome with success.
It's working well .
I have a question about: which device have received vocal command?

I want to know it to send its answer to the good device.

It is possible?

Moreocer, currently, is there a solution to have not static vocal command but command with variable?

Many thanks