I am saying, that while it MIGHT be possible to strip down a NodeMCU to simple Serial to WiFi transceiver mode (as if using an ESP-01) it is probably NOT as easy, since it was never designed for such, nor is it efficient, as that is just a waste of its capabilities. NO I don’t know how to do it, nor am I interested in learning how… it (the NodeMCU) is NOT a moped, but a much more capable motorbike 
IF you need to use both Arduino and NodeMCU linked together, then use the NodeMCU as a standalone WiFi capable Blynk device and link it with the Arduino (running NON blynk code) via Serial or i2C connection. I have done similar simple experiments here…