Need help for creating OPCUA event Acknowledgement in Node-Red

I am working on a project with node-red-contrib-iiot-opcua nodes that needs to Acknowledge the events raised from the OPCUA Server tags/elements but I am not able to understand how to do it.

So please anyone can help in how to do Acknowledgement in node-red opcua, it would be appreciable !

It's there nothing in the examples to get you started?
Node red menu (top right) --> import --> examples --> iiot