In Fluent Forms, Country Field display the Short Value for Dynamic Smartcode in HTML field. Using this JS will replace the Short Value and shows the full country name

ff_country_field_fullValue_inDynamicSmartcode.js

(function() {
    // Wait for the page and all forms to load (especially if loaded via AJAX)
    function ready(fn) {
        if (document.readyState != 'loading'){
            fn();
        } else {
            document.addEventListener('DOMContentLoaded', fn);
        }
    }

    ready(function() {
        // Use Fluent Forms class to find the country select and dynamic value span
        function updateCountryText() {
            var select = document.querySelector('select[name="country-list"]');
            var span = document.querySelector('.ff_dynamic_value[data-ref="country-list"]');
            if (!select || !span) return;

            var code = select.value;
            // Find the full country name using the <option>
            var option = select.querySelector('option[value="' + code + '"]');
            var name = (option && option.textContent) ? option.textContent : code;
            span.textContent = name;
        }

        // On page load and when the dropdown changes
        document.addEventListener('change', function(e) {
            if (e.target && e.target.name === "country-list") {
                updateCountryText();
            }
        });

        // Update on page load (and after Fluent Forms renders, for AJAX forms)
        setTimeout(updateCountryText, 300);
    });
})();