There is an option to message with other player on in a group created over Stadia: https://support.google.com/stadia/answer/10212271?hl=en-GB
Also check here: https://support.google.com/stadia/answer/9609774
There is an option to message with other player on in a group created over Stadia: https://support.google.com/stadia/answer/10212271?hl=en-GB
Also check here: https://support.google.com/stadia/answer/9609774