Filter the field object after it has been hydrated.
Apply to all fields on all forms.
add_filter( 'gppa_hydrated_field', 'my_custom_function' );
Apply to all fields on a specific form.
add_filter( 'gppa_hydrated_field_FORMID', 'my_custom_function' );
Apply to a specific field on a specific form.
add_filter( 'gppa_hydrated_field_FORMID_FIELDID', 'my_custom_function' );
The field object that has been hydrated.
The current form object to which the hydrated field belongs.
This filter is available since Gravity Forms Populate Anything 1.0-beta-4.166.