I made it possible by writing a script in the function.

onCountryChange(event: any) {

    //this will get me the whole selected title containing name of the country and dial code of that country
  var title = $('.country .iti__selected-flag').attr('title')
//splitting both
  var splitted = title.split(':')
//getting country name
  var countryCode = splitted[1];
//getting dial code of the country
  this.UserCountryDialCode = splitted[0];
}