now I solved the problem with esp32_digital_led_lib library.

Example:
[CODE]
#include "esp32_digital_led_lib.h"

// Enumberation ob LED's
// 9 0
// 8 1
// 7 2
// 6 3
// 5 4

#define LED_PORT 15

strand_t m_sLeds = {.rmtChannel = 0, .gpioNum = 15, .ledType = LED_WS2812B_V3, .brightLimit = 32, .numPixels = 10, .pixels = nullptr, ._stateVars = nullptr};

void Led_Init(void) {
pinMode (LED_PORT, OUTPUT);
digitalWrite (LED_PORT, LOW);

if(digitalLeds_initStrands(&m_sLeds, 1)) {
    E_TRACE("Can't init LED driver()\n");
}

digitalLeds_resetPixels(&m_sLeds);

// Set led 7 to red
m_sLeds.pixels[7] = pixelFromRGBW(55, 0, 0, 0);

digitalLeds_updatePixels(&m_sLeds);

}

[/CODE]

Try Adafruit_NeoPixel.h library. Set pin to 15(GPIO) and number pixels to 10. Enjoy.

#include <Adafruit_NeoPixel.h>
#include <M5Stack.h>

#define PIN 15
#define NUMPIXELS 10

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB);
int delayval = 500;

void setup(){

M5.begin();
pixels.begin();
}

void loop() {

for(int i=0;i<NUMPIXELS;i++){
// pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
pixels.setPixelColor(i, pixels.Color(0,0,150)); // Moderately bright BLUE color.
pixels.show(); // This sends the updated pixel color to the hardware.
delay(delayval); // Delay for a period of time (in milliseconds).
}
}