[QUESTIONS] change attribute value that is generated through trait

I'd say it's enough just this

getValueForTarget: function() {
    return 'item.text' + this.model.get('value');
  }

You should be able to achieve it via a custom trait, eg. by overriding getValueForTarget method

I tried creating custom trait and override a method but didn't see any attribute generated. can you please look at this code and correct me if there's any error. When I write data in traits it should generate attribute as ':text=item.text.data' at datatextfield.

 getInputEl: function() {
    if (!this.inputEl) {
      var input = document.createElement('textarea');
      input.value = this.target.get('content');
      this.inputEl = input;
    }
    return this.inputEl;
  },

  /**
   * Triggered when the value of the model is changed
   */
  onValueChange: function () {
    this.target.set('content', this.model.get('value'));
  },
  
  getValueForTarget: function() {
      console.log("inside getValueForTargetss")
    return this.model.get( 'item.text' + 'value');
  }
});