Vaadin Spreadsheet NO border for Empty cells

Hi everyone,

I am working on styling the vaadin spreadsheet. Vaadin spreadsheet is created with 1000 rows and 100 columns, without importing excel file. Then cells are created with values and are styled accordingly. Now, I am facing problem in making the non-value empty cells BORDERLESS?

The problem is that inorder to style the empty cells , we have to create the cells first and make it borderless. But creating cells for 1000 rows and 100 columns is not efficient at all and is making the tool very slow.

Any smart way of achieving the goal of making the non-value empty cells borderless?

Please see the attachment to see the desired output.

Any inputs will be highly appreciated.