How to write a function that returns InfluxDb2 data?

Question

The example that the InfluxDb2 documentation provides for reading data is the following:

const queryApi = new InfluxDB({url, token}).getQueryApi(org);
const fluxQuery = '<flux query>';

const fluxObserver = {
  next(row, tableMeta) {
    const o = tableMeta.toObject(row)
    console.log(`${o._time} ${o._measurement}: ${o._field}=${o._value}`);
  }
}

queryApi.queryRows(fluxQuery, fluxObserver)

This reads the data and prints it row by row to the console.

But how to write a function that gives the data as a return value? Something like this:

function () {
    const queryApi = new InfluxDB({url, token}).getQueryApi(org);
    const fluxQuery = '<flux query>';

    var result = [];
    const fluxObserver = {
        next(row, tableMeta) {
            const o = tableMeta.toObject(row)
            result.push(o._value);
        }
    }

    queryApi.queryRows(fluxQuery, fluxObserver)

    return result;  // this does not work
}