如何构造一个(字段A*字段B+字段C) < f的mongoose查询？

const mongoose = require('mongoose');

const modelSchema = new mongoose.Schema({
  fieldA: Number,
  fieldB: Number,
  fieldC: Number
});

const Model = mongoose.model('Model', modelSchema);

const f = 10;

const query = Model.find({
  $expr: {
    $lt: [
      { $add: [{ $multiply: ['$fieldA', '$fieldB'] }, '$fieldC'] },
      f
    ]
  }
});

query.exec((err, result) => {
  if (err) {
    console.error(err);
    return;
  }

  console.log(result);
});