Express query parser option defaults to 'simple'. How to make query parse safe?

Question

Since Express 5.x, the query parser option defaults to 'simple'. This seems to be due to some security issues, see https://github.com/expressjs/express/issues/3361. This caused previous queries to not be parsed correctly. I want to use the lt keyword in Mongoose to filter the ratingsQuantity field in the database. Because the default options of the query parser have changed, ratingsQuantity[lt]=50 cannot be correctly parsed into ratingsQuantity: { lt: '50' }

const express = require("express");

const app = express();

app.listen(3000, "127.0.0.1", () => {
  console.log("listing");
});

app.use("/api/v1/tours", (req, res) => {
  res.json({
    status: "success",
    debug: {
      query: req.query,
    },
  });
});

Use the GET method to 127.0.0.1:3000/api/v1/tours?ratingsQuantity[lt]=50

{
    "status": "success",
    "debug": {
        "query": {
            "ratingsQuantity[lt]": "50"
        }
    }
}

I want to parse ratingsQuantity[lt]=50 as ratingsQuantity: { lt: '50' }. How can I do this safely and conveniently? If I directly use app.set("query parser", "extended") to toggle the option, wouldn't that also lead to the security issue mentioned in the issue?

After using app.set("query parser", "extended")

{
    "status": "success",
    "debug": {
        "query": {
            "ratingsQuantity": {
                "lt": "50"
            }
        }
    }
}