Yes and no.
The viewers JWT doesn’t have write access.
But you could in theory recieve the viewers action somehow in an open broadcasters view.
And then write to the config service.
This isn’t ideal and a EBS would be preferential.
There are a lot of security implications here, hence the viewers JWT cannot write to the config service.
Without a server it’s a clusterfuck to do it and involves too much over head from the broadcaster.
If you have an EBS or some sort of backend service then you can do what you need to do securely.