AutoCAD Inventor :: Custom Feature Control Frame Type Annotation?

I'm looking to do sort of an adaptive annotation thorugh vb.net.

Essentially i'd like it start with a leader and instead of your normal text dial that appears, you get a box to punch in values in a grid. 5 columns across, as many as two rows.

The idea being if i punch in 1, 2, 3, 4, 5, 6 in the first six boxes all 5 in the first row appear with boxes around each number and then only the 6 has aa box around it on row 2.

I can see it as a table 5x2, and the format option being if the cell has text, the border type is outline. Although i don't think those options exist for inventor.