There are a couple of documented interfaces to talk to Google Sheets from LSL
AKfycbwgw8GAHz5FIUekdSEU-ULARnPbdm0hefT4cc5js9rHUS4V8QCoJ5qXB9_FqftXTUci
https://script.google.com/macros/s/AKfycbwgw8GAHz5FIUekdSEU-ULARnPbdm0hefT4cc5js9rHUS4V8QCoJ5qXB9_FqftXTUci/exec