I’ve not got a Q800F but in reading about it I get mixed messages about what it can do with Google. The most convincing description I’ve seen is that it can act as a Google cast device and it ‘Works with Google Home’ so other Google Assistant devices can control it, but it can’t act as a Google voice assistant itself, only Alexa.
Hopefully someone else on here has one of the devices.
Thanks; I have added the smartthings Skil in Alexa so i see my soundbar in the Alexa App but the soundbar have not the same parameters than my EchoDot and I can’t parameter it to use the microphone etc.