How to show continuous serial number in naygest grid

[arivu1995]

my current code
` $grid4 = new Grid(
(new GridConfig)
->setDataProvider(
new EloquentDataProvider($query)
)
->setName('work_grid')
->setPageSize(10)
->setColumns([

                (new FieldConfig)
                ->setName('id')
                ->setLabel('S.No.')
                ->setSortable(true)
                ->setCallback(function ($val, ObjectDataRow $dr) {
                    
                    static $val = 0;
                    return ++$val;
                    
                 })
                  
                ->setSortable(true)
                ->addFilter(
                    (new FilterConfig)
                        ->setOperator(FilterConfig::OPERATOR_LIKE)
                )
            , `

Thanks in advance..