Possible to change widget's attribute via Javascript?

Content

I'm in need of changing the "input/FormInput" widget's "required" attribute value dynamically via javascript based on a certain selection. Is it even possible to do so? The "Incident.CustomFields.c.abc" is used with the "input/FormInput" widget.

 

The code I'm using is as follows:

constructor: function() {        
    /* some code above this line */     
    this._radioButtons.on('click', this.onAccountTypeSelect, this); // this is the trigger
},
onAccountTypeSelect: function(evt) {
   var selectedValue = evt.target.get('value');
   if(selectedValue === 'A')
   {
      // make Incident.CustomFields.c.abc as required
   }
   else
   {
      // make Incident.CustomFields.c.abc as not required
   }
}

Version

3.7