Setting boolean/date attributes to null

### Which Specific Feature is your question related to?

Data Manager

### Question

When creating a new model in Amplify Studio Data Manager, is it possible to set boolean or date attributes to null? It appears boolean attributes can only be toggled between true or false, and date attributes can only be selected from the calendar. Whenever I need to test null attributes for boolean or date attributes, I've been creating the models and sending POST requests in JavaScript, which is much slower than if I could do it in Amplify Studio.

Start in the Amplify Studio Data Manager and reproduce the boolean and date attribute editors shown in the screenshots. Compare their behavior with the JavaScript POST workflow described in the issue. Done means users can create records with null boolean and date attributes directly in Data Manager.

Written by the indexing model from the issue text.