Hey Zhon,
How have you been?
My name is Tim Huang and I am a Publisher Relations Manager with Vungle.
I had just interface with our Tech Support Team about this issue and we are not familiar with Construct 2; We don't have anything in-house as well. I would recommend asking CocoonJS if they have made a plugin compatible with Vungle. ()
Feel free to contact me at my work email - - and we can continue this convo if you need further assistance.
Regards,
Tim