ArduinoJSON with 2 different JsonDocument in the same MQTT CallBack function

I use MQTT library with ArduinoJSON with 2 different JsonDocument in the same MQTT CallBack function. It is the right way to use ArduinoJson library in MQTT callBack function
https://github.com/256dpi/arduino-mqtt Thank you

void messageReceived(String &topic, String &payload_mqtt) {

  topic.reserve(32); 
  payload_mqtt.reserve(128); 

/* 
If you write topic == "foo" you're comparing pointer equality, 
which will always fail since the pointer to "foo" will never be the same as the pointer to topic. 
You need to use the equals method on the String class: topic.equals("foo") to compare the contents of the two strings.
*/
  
  if(topic.equals("topic_grid")) {                                               // "topic_grid" from Mk2 router
    
    DynamicJsonDocument doc1(128);                                               // Allocate a temporary JsonDocument
    
    DeserializationError error = deserializeJson(doc1, payload_mqtt);
    if (error) {                                                                 // Test if parsing succeeds 
      count_json++;                      
      return;                                                                    // Terminate the function
    }  
      
    PW = doc1["PW"]; 
    PR = doc1["PR"];
    L1 = doc1["L1"];
    L2 = doc1["L2"];
    L3 = doc1["L3"];  

    doc1.clear(); 
  } 
                                                                                                                        
/* 

{"FCST_D1":15,"FCST_D2":12,"FCST_3H":11,"FCST_6H":10}  

Data structures	    64	Bytes needed to stores the JSON objects and arrays in memory
Strings	            32	Bytes needed to stores the strings in memory
Total (minimum)	    96	Minimum capacity for the JsonDocument.
Total (recommended) 128	Including some slack in case the strings change, and rounded to a power of two  
*/ 

  if (topic.equals("topic_forecast")) {                                               
  
    DynamicJsonDocument doc2(128);  
    DeserializationError error = deserializeJson(doc2, payload_mqtt);
    if (error) {                                                                 // Test if parsing succeeds     
      count_json++;                                                                                                        
      return;
    }                                                                            // Terminate the function
      
    FCST_D1 = doc2["fcst_d1"];  
    FCST_D2 = doc2["fcst_d2"];  
    FCST_3H = doc2["fcst_3h"];  
    FCST_6H = doc2["fcst_6h"];  

    doc2.clear(); 
  } 

  if (topic.equals("topic_VOC/GarageCOV/voc")) {   
    VOC_garage = payload_mqtt.toInt();
  } 
 }