How to make a popup message "in the cloud"?

Question

Yandex maps

Hello.
Not without the help of the community, I raised this geo-service, adjusted the display of icons in the visibility zone, etc., but now the question is this:
There is a field for entering a short message - an analogue of commenting by drivers in Yandex Traffic. How to implement a similar popup message above the marker?
It will be called both when typing (socket.on('typing')), and when publishing a message by someone in the scope. An example of such a message on the screen:
https://vk.com/photo475291120_456239118