Add custom Fields to property options

index.js

Component.override('sw-property-option-detail', {
    template,

    data() {
        return {
            ...
            customFieldSets: []
        };
    },

    computed: {
        customFieldSetRepository() {
            return this.repositoryFactory.create('custom_field_set');
        },

        customFieldSetCriteria() {
            const criteria = new Criteria(1, 100);

            criteria.addFilter(Criteria.equals('relations.entityName', 'propertyOption'));
            criteria
                .getAssociation('customFields')
                .addSorting(Criteria.sort('config.customFieldPosition', 'ASC', true));

            return criteria;
        },
    },

    methods: {
        loadEntityData() {
            ...
            this.customFieldSetRepository
                .search(this.customFieldSetCriteria, Shopware.Context.api)
                .then((result) => {
                    this.customFieldSets = result.filter((set) => set.customFields.length > 0);
                });
        },
    }
});

sw-property-option-detail.html.twig

...
<sw-card :title="$tc('sw-settings-custom-field.general.mainMenuItemGeneral')"
         v-if="customFieldSets.length > 0"
         :isLoading="isLoading">
  <sw-custom-field-set-renderer
    v-if="currentOption"
    :entity="currentOption" 
    :sets="customFieldSets"
    :disabled="!allowEdit"> 
  </sw-custom-field-set-renderer>
</sw-card>
...