{
        type: 'page',
        data: {
          items: [
            {
              id: 1
            }
          ]
        },
        body: {
          type: 'crud',
          source: '${items}',
          columns: [
            {
              name: 'id',
              label: 'id',
              className: {
                primary: '${id > 0}',
               danger: '${id < 0}'
              }
            }
          ]
        }
      }