// Da qui aggiungo un nuovo elemento
<div class="col-md-6" v-for="feature in this.venues_features" v-if="!checkForAllFeaturesList(feature)">
    <p>
        <span class="btn btn-success btn-xs mr-2" @click="addFeatureFromList(feature)">
            <i class="fa fa-plus" ></i>
        </span>
        {{ feature.name }}
    </p>
</div>

// Qui avviene l'aggiunta del nuovo elemento
addFeatureFromList(feature) {
    this.venueFeaturesAvailable.push(feature);
    this.venueFeatures[feature.id] = true;
}

// Qui c'è il for che genera gli switch
<div class="col-md-6" v-for="feature in venueFeaturesAvailable" v-if="feature">
    <label class="switch switch-success">
        <input type="checkbox" class="switch-input" v-model="venueFeatures[feature.id]">
        <span class="switch-slider"></span>
    </label>
</div>