Custom filter on Laravel 5.5 using Yajra datatables package

I followed this guide https://datatables.yajrabox.com/fluent/custom-filter (all the code is available on the link) on implementing a custom search box. Now I have certain fields which are checkboxes and a user can tick several check boxes. I'm stuck on how I can iterate multiple multiple checkboxes and input fields. Anyone done this before? @yajra could please help if you can? TIA.