Hello, someone already managed to read an internal variable in shell.exec?

***example -- nodejs

var shell = require('shelljs');
var ssid = atak;
var password = 554032;

shell.exec('wpa_passphrase "$ssid" "$password" | sudo tee -a /etc/wpa_supplicant/wpa_supplicant.conf', {async:true});

does not work that way?