How to make interpolation printing at fixed position?

Hi, I have a special requirement. I need to make some interpolation printed
in fixed position without being affected by length of previous one in the
same row. because the output txt file will be read by another program, so it
has to follow a strict format.
for example, a template file:
A=$a  B=$b
1234567890

current $b is at the 9th-char position, but if value of $a is longer than 2
chars, the $b starting position will not be at 10th-char.

if $a=xy, $b=gh, output:
A=xy  B=gh

but if $a=wxyz $b=gh, the output is:
A=wxyz  B=gh

if I want B=$b is always printed at the fixed position(9th-char), it seems
the only way is to make the length of $b's prceeding interpolation fixed. of
course, this means some data in $a might be trimed.

There is no such directive or built-in to do this. I think maybe I should
write a user-defined directive to perform this function.
Does any one has any suggestion?
Thanks.

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