Split the "rounding" option for tables from needing a header as a prerequisite.

[GeneralK]

• [ ✔] I agree to follow the Code of Conduct that this project adheres to.
• [ ✔] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Is your feature request related to a problem? Please describe.
When I create my tables, I have to find ways to hide the header. Since rounding requires the table to have a header.
Which does not work aesthetically.

This what a hidden header table looks like with our current restriction. (I hid the Header Border)
Another way of hiding the header is to remove the divider. Which is tremendously ugly.

Describe the solution you'd like

I wish to be able to create a table without header, and still be able to round the corners.

Describe alternatives you've considered
Maybe allowing shapes to "extend a cell" feature? Or introduce "division" into a shape?
So essentially, we can split a rounded rectangle shape into "cells" and have a work around.

Additional context
I believe this user has the same vision as I do. But they put it under bugs. So I'm not sure if my post is seen as a duplicate or not.
#4513