Esp32 execute AT command from User-defined AT Command

How can I execute other AT command from User-defined AT Command?
For example

at_custom_cmd.c:

static uint8_t at_test_cmd_test(uint8_t *cmd_name)
{
    uint8_t buffer[64] = {0};
    snprintf((char *)buffer, 64, "test command: <AT%s=?> is executed\r\n", cmd_name);
    esp_at_port_write_data(buffer, strlen((char *)buffer));

    EXEC("AT+HTTPCGET="http://www.my.com");  // <-- How can I do it?

    return ESP_AT_RESULT_CODE_OK;
}

I tried to search exec command in offical site, but didn’t find.

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