A field’s settings can be set dynamically when the form is rendered on the page – this is when the field data is “localized” to the page for use by the form.
Dynamic Field Settings
The number field uses the settings num_min, num_max, num_step, which are unique to the number field and can be set dynamically when localized.
add_filter( ‘ninja_forms_localize_field’, ‘my_callback’ );
add_filter( ‘ninja_forms_localize_field_’ . $field_type, ‘my_callback’ );