Could it be possible to set the table text default font size (and perhaps other properties) e.g. in the beginning of the table for all table cells?

E.g. \n %(font:32)% \n Header 1, Header 2, %(font:20)Header 3% 1,2,3\n 4,5,6\n

This would make all cells font 32 except "Header 3".

You can set the default font size for the table using the "Text" property in the Properties View.