Add custom jquery validation

Hi!

I need create a text field (or number field with input mask). The field contains a number with 11 numeric digits and the following mask: 999.999.999-14.

The mask is ok. But I need to do a validation for the last 2 digits, which are checking the first 9 digits. I have a jquery function ready for this.

How do I add this validation function in ampo, in the same way as the required field validation?

That is, by clicking the XXX button I want the program to check:

1. If the field has been filled (ok)
2. My custom validation function