Explicity set value binding handler inside a custom binding handler with knockout.js

I am trying to get the observable FirstName to take like the default value binding on the element. For some reason the ko.bindingHandlers.value.init below doesnt work. When I update the textbox it doesnt refelect in the property, however if I manually set the value binding on the element it works fine.

HTML

<td class="text-center text-nowrap">
    @Html.TextBoxFor(q => q.Number, new { data_bind = "dynamicFormList: { observable: true, value: FirstName }" })
</td>

Handler

ko.bindingHandlers.dynamicFormList = {
        init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
            var values = ko.utils.unwrapObservable(valueAccessor());
            if (values.observable && values.value) {
                ko.bindingHandlers.value.init(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
            }
        }
}