ser(&quot;My Field&quot;, { SelectionMode: FieldUserSelectionMode.PeopleOnly, Group: &quot;My Group&quot; });

// we can use this 'field' variable to run more queries on the field:
const r = await field.field.select(&quot;Id&quot;)();

// log the field Id to console
console.log(r.Id);

// **
// Adding a lookup that supports multiple values takes two calls:
const fieldAddResult = await sp.web.fields.addUser(&quot;Multi User Field&quot;, { SelectionMode: FieldUserSelectionMode.PeopleOnly });
await fieldAddRes