Label Graph GigaDisplay

Official Hardware Mega GIGA Display Shield
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I made this code to graph outputs from 3 pins. Is there any way to label this graph?

#include <Arduino_GigaDisplay.h>
#include <lvgl.h>
#include "Arduino_H7_Video.h"
#include "ArduinoGraphics.h"


Arduino_H7_Video Display(800, 480, GigaDisplayShield);


#define OP1_PIN A0
#define OP2_PIN A1
#define OP3_PIN A2




static lv_obj_t * chart;
static lv_chart_series_t * ser1;
static lv_chart_series_t * ser2;
static lv_chart_series_t * ser3;








unsigned long previousDataPointMillis = 0;
const long dataPointInterval = 1000;
unsigned long chartStartTime = 0;
const unsigned long chartClearInterval = 60000;




void setup() {




 Serial.begin(115200);
 Display.begin();








 chart = lv_chart_create(lv_scr_act());








 lv_obj_set_size(chart, Display.width(), Display.height());




 lv_obj_align(chart, LV_ALIGN_CENTER, 0, 0);








 lv_chart_set_type(chart, LV_CHART_TYPE_LINE);




 lv_chart_set_range(chart, LV_CHART_AXIS_PRIMARY_Y, 0, 1023);








 lv_chart_set_range(chart, LV_CHART_AXIS_PRIMARY_X, 0, 60);








 lv_chart_set_point_count(chart, 61);




 // --- Add the Three Lines (Data Series) ---
 ser1 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_PRIMARY_Y);
 ser2 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_GREEN), LV_CHART_AXIS_PRIMARY_Y);
 ser3 = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_BLUE), LV_CHART_AXIS_PRIMARY_Y);




 // Record the start time
 chartStartTime = millis();
}




void loop() {
 unsigned long currentMillis = millis();




 // --- Add a new data point every second ---
 if (currentMillis - previousDataPointMillis >= dataPointInterval) {
   previousDataPointMillis = currentMillis;




   // Read the analog values
   int op1Value = analogRead(OP1_PIN);
   int op2Value = analogRead(OP2_PIN);
   int op3Value = analogRead(OP3_PIN);
 
   // Print values to Serial Monitor for debugging
   Serial.print("OP1: ");
   Serial.print(op1Value);
   Serial.print(", OP2: ");
   Serial.print(op2Value);
   Serial.print(", PM 2.5: ");
   Serial.println(op3Value);




   // Add the new values to the chart's data series
   lv_chart_set_next_value(chart, ser1, op1Value);
   lv_chart_set_next_value(chart, ser2, op2Value);
   lv_chart_set_next_value(chart, ser3, op3Value);
 }



 // LVGL's internal handler. This needs to be called in the loop.
 lv_timer_handler();
 delay(500); // A small delay is good practice
}
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