Text formatting channel padding

There should be a way to set fields in the Text Formatting Channel to have padding with leading 0s. E.g. If set to be padded to 3 digits then 5 would be printed as "005". This is effectively the "Number of Decimals" filed, but in the other direction.

An application would be for a clock formatted string (e.g. for countdowns). currently, 0 hours, 5 minutes, 17 seconds would print as "0:5:7" instead of the desired "00:05:07".

For searching, this may be referred to ass Padding, Leading Zeros, Leading 0s, Fixed Length Numbers, Number of Digits, or Significance.