Link table cell size and shape size in Pages 5.5

I am a stage manager, and I am creating a rehearsal report. I like to have mine look good as well as give all the pertinents. The report has different categories, each category is it's own table so I can type in action items for that category.

I have created a table with no outside border and grouped it with a rounded rectangle, so the rounded rectangle acts as the border. However, when I type notes in the cells, the cells become bigger when needed, but the border remains the same size.

Is there a way to automatically link the size of the cell with the shape so that I don't have to keep reformatting for various amounts of information?