Restrict Contact Zip code field to numbers only

Hello ,

On the Contact page, we have a field Zip code. Currently, it is a text field and allows any characters.

We would like to restrict this field so that users can only enter numbers (e.g., digits 0–9) and not text or special characters.

Is there a way to enforce this in Freedom UI (for example by changing the data type, using validators, or applying an input mask)?