How to auto populate preferredCountries from intl-tel-input with db output

PHP Snippet 1:

preferedCountries = JSON.parse(data)
iti.destroy();
iti = window.intlTelInput(input, {
    separateDialCode: "true",
    autoHideDialCode: "true",
    autoPlaceholder: "polite",
    preferredCountries: preferedCountries,
    utilsScript: "https://cdnjs.cloudflare.com/ajax/libs/intl-tel-input/14.0.7/js/utils.js",
    customPlaceholder: function(selectedCountryPlaceholder, selectedCountryData) {
        return "e.g. " + selectedCountryPlaceholder;
    }
});