Flutter - Read json from local file and search and update UI

Question

I am reading a local json file in a provider

      Future<List<ProductModel>> readJsonData() async {
    final jsondata = await rootBundle.loadString('jsonData/products.json');
    final list = json.decode(jsondata) as List<dynamic>;
    var _listOfProducts = list.map((e) => ProductModel.fromJson(e)).toList();
    return _listOfProducts;
  }

and the search function

      void searchProduct(String searchText) {
    if (searchText == '') {
      return;
    }
    final products = listProducts.where((product) {
      final nameLowerCase = product.name!.toLowerCase();
      final searchTextLowerCase = searchText.toLowerCase();
      return nameLowerCase.contains(searchTextLowerCase);
    }).toList();
    _searchString = searchText;
    listProducts = products;
    notifyListeners();
  }

and then rendering it like so:

                Consumer<ProductsProvider>(builder: (context, productData, child) {
              //print(productData.listProducts.toString());
              return FutureBuilder(
                  future: _productsProvider.readJsonData(),
                  builder: (context, data) {
/// I BELIEVE THIS IS THE CAUSE WHY THE UI WON'T UPDATE
                    productData.listProducts = data.data as List<ProductModel>;
                    return Expanded(
                      child: ListView.builder(
                        shrinkWrap: true,
                        itemCount: productData.listProducts.length,
                        itemBuilder: (context, index) => Card(
                          elevation: 3,
                          child: ListTile(
                            title: Text(productData.listProducts[index].name!),
                          ),
                        ),
                      ),
                    );
                  });
            })

search textfield onChange:

                  onChanged: (value) {
                _productsProvider.searchProduct(value);
              },

The search works but the UI doesn't change, the list doesn't get filtered because of the line after the comment (above). How do I deal with this so that I get all the items before search (or when the searchText is empty) and the filtered items(list) when there is a searchText?