Get currentUser object and then append it to a multi user field from Javascript

SP.FieldUserValue

var ctx = SP.ClientContext.get_current();
var web = ctx.get_web();
ctx.load(web);
ctx.executeQueryAsync(function() {

}, function() {
  console.error('error');
});


var lists = web.get_lists();
ctx.load(lists);
ctx.executeQueryAsync(function() {
  console.log('success');
}, function() {
  console.log('error');
});

var multiuser = lists.getByTitle('multiuser');
var item = multiuser.getItemById(1);
ctx.load(multiuser);
ctx.load(item);
ctx.executeQueryAsync(function() {
  console.log('success');
}, function() {
  console.log('error');
});


var currentUserObject = web.get_currentUser();
ctx.load(currentUserObject);
ctx.executeQueryAsync(function() {
  console.log('success');
}, function() {
  console.log('error');
});

var currentUserValue = new SP.FieldUserValue();
currentUserValue.set_lookupId(currentUserObject.get_id());

var poc = item.get_item('POC');
poc.push(currentUserValue);

item.set_item('POC', poc);
item.update();

ctx.load(item);
ctx.executeQueryAsync(function() {
  console.log('success');
}, function() {
  console.log('error');
});