Get a value from a variable in javascript and pass to code-behind variable of type List<>

Question

I'm calling a webservice and passing back a List<> from an Ajax call. Now I need to get that value and pass it to code-behind file with a data type of List<>. Can this be done and if so how can I do it. I've looked here for the solution but I didn't see anything like this. I tried a HiddenField but I get an error that it can't convert from List<> to string.

function GetEnrollmentRecords() {
    IsLoading = true;

    $.ajax({
        type: "POST",
        url: "EnrollmentService.asmx/GetEnrollmentRecords",
        data: "{qryLastRecord: " + LastRecord  + "}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: OnGetEnrollmentRecordsSuccess,
        failure: function (response) {
            IsLoading = false;
        
        },
        error: function (response) {
            IsLoading = false;
       
        }
    });
}

function OnGetEnrollmentRecordsSuccess(response) {
    var responseObject = response.d;

    LastRecord = responseObject.intLastRecord;
    var hdnfldVariable = document.getElementById('ListOfEnrollments');
    hdnfldVariable.value = Object.values(responseObject.enrollments);

    IsLoading = false;
}