Soldering a new led on a wired CL x360 pad

Hi guys. I’m trying a padhack with a green “activation LED” on a wired CL x360 PCB.

My idea is to have a LED that turns on automatically when I plug the controller.

Can I solder it between +5V and ground solder points?

I have read that green LEDs work with 2V-3.5V. Do I need some kind of resistor between +5V solder point and the LED?