How do I use input from a question as a var in the second question right below it on the same page?

// From Date
from_field = this.getQuestionContainer().querySelector(".InputText");
from_field.readOnly = true;


jQuery(from_field).datepicker({
    dateFormat: "mm/dd/yy",
});

//To Date
Qualtrics.SurveyEngine.addOnReady(function () {
    to_field = this.getQuestionContainer().querySelector(".InputText");
    to_field.readOnly = true;


    from_field.oninput = function () {
        var to_date = new Date(to_field.value);
        var from_date = new Date(from_field.value);
        
        // Increment the from date by one day and create min_date
        from_date.setDate(from_date.getDate() + 1);
        var min_date = (from_date.getMonth() + 1) + "/" + from_date.getDate() + "/" + from_date.getFullYear();
        
        // Update the DatePicker Element
        jQuery(to_field).datepicker("destroy");
        jQuery(to_field).datepicker({
            dateFormat: "mm/dd/yy",
            minDate: min_date,
        });
        // Clear the to date if it is less than the from date
        if (to_date <= from_date) {
            to_field.value = "";
        }
    };
});