ESPHome one http request with multiple sensors

ESPHome
2 
interval:
  - interval: 1min
    then:
      - http_request.post:
          url: !lambda |-
            char buf1[64];
            char buf2[64];
            sprintf(buf1, "%0.1f", id(hum).state);
            sprintf(buf2, "%0.1f", id(temp).state);
            return ((std::string) "https://api.thingspeak.com/update?api_key=1234567890234567&field1=" + buf1 + "&field2=" + buf2).c_str();