Reading a influx measurement using an esp32 and Ardino

I need to read a temperature present in an influx v1.8 database, using esp8266 and esp32 in Arduino. I am using the esp8266 influxdb library.

This query works from the command prompt on the influx server and also in Grafana: SELECT last("temperature") FROM "sens848a6a6" WHERE time >= now() - 6h and time <= now()

The influxdb library does not like this: Query result error: {"error":"loc 1:13-1:26: string literal key \"temperature\" must have a value"}

I expect is only understant flux?

Using this as a query: String query = "from(bucket: \"test01/autogen\") |> range(start: -1m) |> filter(fn: (r) => r._measurement == \"sens848a6a6\" and r._field == \"temperature\")"; results in a 0 value.

This is the example code I used:

  String query = "from(bucket: \"test01/autogen\") |> range(start: -1m) |> filter(fn: (r) => r._measurement == \"sens848a6a6\" and r._field == \"temperature\")";
  // Send query to the server and get result
  FluxQueryResult result = client.query(query);
  while (result.next()) {
    // Get typed value for flux result column 'temperature'
    
    String temp = result.getValueByName("temperature").getString();
    Serial.print("temperature: ");
    Serial.print(temp);
    
    // Get converted value for flux result column '_value' where there is RSSI value
    long value = result.getValueByName("_value").getLong();
    Serial.print(value);
    Serial.println();
  }
  // Check if there was an error
  if(result.getError() != "") {
    Serial.print("Query result error: ");
    Serial.println(result.getError());
  }

So what is the correct way to get this sensor value from a V1.8 database?