How to make maxlength attribute accessible?

I have a form in which there are a few input fields. For one of the input field I have a length validation, for which I used maxlength="20".

The issue here is that the JAWS users don't come to know that the max length has been reached in the input field, as JAWS continues to keep on reading the key they press on their keyboard.

Is there a way to make this accessible?