Custom query in summaries

 ->columns([
                TextColumn::make('mainStock.item.item_name'),
                TextColumn::make('quantity'),
                TextColumn::make('cost_price')
                ->label('Cost Price'),
                TextColumn::make('mrp')
                ->summarize(Summarizer::make()
                ->label('Total')
                ->using(fn (Builder $query): string => $query->sum('mrp'))),
            ])

 ->columns([
                TextColumn::make('mainStock.item.item_name'),
                TextColumn::make('quantity'),
                TextColumn::make('cost_price')
                ->label('Cost Price'),
                TextColumn::make('mrp')
                ->summarize(Summarizer::make()
                ->label('Total')
                ->using(fn (Builder $query): string => $query->sum('mrp'))),
            ])