how to detect if option selected or not in vue

I have radio buttons yes or no by default no buttons are selected . I want to display an alert if the user didn’t select any option and clicked submit button. problem is there are not only one option like that there 70 option so i can not detect each option one by one i I am finding generic way

html

<ion-radio-group
        @ionChange="updateWorkSheet($event, 'pm_properly_loop_handling')"
        :value="pm_properly_loop_handling"
      >
        <ion-list-header>
          <ion-label text-wrap style="padding-right: 15px;">Adecuado manejo de lazo</ion-label>
        </ion-list-header>

        <ion-item>
          <ion-label>Si</ion-label>
          <ion-radio slot="start" value="1"></ion-radio>
        </ion-item>

        <ion-item>
          <ion-label>No</ion-label>
          <ion-radio slot="start" value="0"></ion-radio>
        </ion-item>
      </ion-radio-group>

      <ion-radio-group
        @ionChange="updateWorkSheet($event, 'pm_curicon_was_burned')"
        :value="pm_curicon_was_burned"
      >
        <ion-list-header>
          <ion-label text-wrap style="padding-right: 15px;">El material usado de curación fue quemado</ion-label>
        </ion-list-header>

        <ion-item>
          <ion-label>Si</ion-label>
          <ion-radio slot="start" value="1"></ion-radio>
        </ion-item>

        <ion-item>
          <ion-label>No</ion-label>
          <ion-radio slot="start" value="0"></ion-radio>
        </ion-item>
      </ion-radio-group>

 <section>
        <ion-button >
          expand="full"
          @click="submit()"
    
          shape="round"
        >Ingresar información de cortadores</ion-button>
      
      </section>

script

  data() {
    return {
  

}
},methods
{
  funtion submit()
{
  //handle here
}
]