Accessible form validation

Hi,
I am using the validation rules and I am having some problems when trying to make them accessible.
Issue 1: When using the (aria-invalid=“false”) in input form field, the value for the attribute doesn’t change to “true” when an error occurs. How can I change the value from false to true on error?

Issue 2: How can I modify the output code for the error message? I need to add an id to it, so that the (aria-describedby) can point to the the error message id?

Thanks

Juan