How to save GeoPoint in Firebase Cloud Firestore?

I struggled to find out the right import/require. This is what worked for me !!

const firebaseAdmin = require('firebase-admin');
//other code ....

//assigning value to myLocation attribute
let newObject = {
    otherAttribute:"otherAttributeValue",
    myLocation: new firebaseAdmin.firestore.GeoPoint(latitude,longitude)
}

The Firestore SDKs include a GeoPoint class, so you would have to save locations like this:

{
  location: new firebase.firestore.GeoPoint(latitude, longitude)
}