extended-content-list.entity.ts

import { CssFieldMappings, FieldMapping, FieldMappings } from '@progress/sitefinity-widget-designers-sdk';
import { ContentListEntity } from '@progress/sitefinity-nextjs-sdk/widgets';
import { contentListDefaultViewMeta, ContentListEntity } from '@progress/sitefinity-nextjs-sdk/widgets';

const viewMeta = {
    ...contentListDefaultViewMeta,
    CardsListCustom: [
        { fieldTitle: 'Heading', fieldType: 'ShortText' }
    ]
};

export class ExtendedContentListEntity extends ContentListEntity {
    /**
     * Decorators defined here will override the ones from the base entity.
     * Other decorators will be inherited
     */
    @FieldMappings(viewMeta)
    ListFieldMapping: Array<FieldMapping> | null = null;

    /**
     * Decorators defined here will override the ones from the base entity.
     * Other decorators will be inherited
     */
    @CssFieldMappings(viewMeta, true)
    CssClasses: Array<{ FieldName: string; CssClass: string; }> | null = null;
}

...

import { contentListDefaultViewMeta, ContentListEntity } from '@progress/sitefinity-nextjs-sdk/widgets';

const viewMeta = {
    ...contentListDefaultViewMeta,
    CardsListCustom: [
        { fieldTitle: 'Heading', fieldType: 'ShortText' }
    ]
};

...