Technically, you can increase cell inset. I think it probably is a missing feature, but no one so far created an issue.
You can use cell metadata pinning trick in How to distribute column widths equally for specific rows in a table? - #4 by Andrew, How to avoid that a large table footer widens the whole table? - #7 by sijo, How can I robustly make (unknown) tables span the full page width? - #11 by bluss. Then you can check the height difference between opposite cell sides and conditionally include a block with min-height height.