How to get the name of the key bound by the Axis event?

Hi All!
I created the Axis event ‘Moveforward’in input and bound the W key. But later, I hope to get the name of the key W when the moveforward event is executed. I can’t get it by any means. If it is a Action event, there will be a ‘key’ pin in the event node to get the key name, but the Axis event node does not have a ‘key’ pin.

In addition, if I create another independent “W” key event at this time, I try to get the name of the key through this event, but this event will not be executed. It seems that the W key is occupied when the moveforward event is executed. So I want to know in this case, how can I get the name of the key bound in the axis event? Thank you very much.