Is possible to combine Vaadin 8 and a Tomcat 9.x based websocket project?

I want to combine a Vaadin 8 application and a existing websocket project?

Is this possible? I must ensure, that the path of the endpoint of the websocket co-exists with the Vaadin mapping.

A additional servlet []
( []
( []
( with path is possible - annotation or web.xml.

But how can I integrate an endpoint of the websocket in the scope of Vaadin 8?

with best regards