The issue really is holding the plug in place - but if you just want power, and can find a way of attaching the plug, the you could just wire to the GND and 5V pins on the WiFi board (these sit next to the Micro USB socket) and you'd be fine
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
The issue really is holding the plug in place - but if you just want power, and can find a way of attaching the plug, the you could just wire to the GND and 5V pins on the WiFi board (these sit next to the Micro USB socket) and you'd be fine