I’m working on figuring this out and documenting it...
But architecturally, I suspect it’d be a better option to do this as 2 separate fields. Perhaps you could use two form input and use an array as the name, e.g.
<input type="text" name="option[one]" ... />
<input type="text" name="option[two]" ... />
Something like that would cause the values to be submitted in one "node" of the $_POST array ... print_r to see what I mean.