[Vuejs]-V-text-field not able to set defualt value

The only way I was able to do this was with a getter and setter for a computed property pretty counter-intuitive:

 tempSubject: null,
 subject: {
          get(){
            if (this.tempSubject) return this.tempSubject
            return this.$t('trials.trial_feedback_subject', {id: this.trialId})
          },
          set(newValue){
            this.tempSubject = newValue
          }
        },
        canSubmit(){
          return !!this.feedback
        }