Character Spacing between numbers

Hello,

I am creating a PDF form. I would like a space to be automatically created between numbers when filling in the form. There are fields that look something like this

Postcode: |    |    |    |     |
Postcode: ‘1 | 2 | 3 | 4 | 5’

To do this, I need to make the distance from 12345 approximately 1 2 3 4 5. I have not yet found a function with which this is possible?

With a normal field, the user writes the numbers in the distance separators.

Regards