Nuxt/examples/named-views/nuxt.config.js

export default {
  router: {
    extendRoutes (routes, resolve) {
      const indexIndex = routes.findIndex(route => route.name === 'index')
      let index = routes[indexIndex].children.findIndex(route => route.name === 'index-child-id')
      routes[indexIndex].children[index] = {
        ...routes[indexIndex].children[index],
        components: {
          default: routes[indexIndex].children[index].component,
          left: resolve(__dirname, 'components/childLeft.vue')
        },
        chunkNames: {
          left: 'components/childLeft'
        }
      }

      index = routes.findIndex(route => route.name === 'main')
      routes[index] = {
        ...routes[index],
        components: {
          default: routes[index].component,
          top: resolve(__dirname, 'components/mainTop.vue')
        },
        chunkNames: {
          top: 'components/mainTop'
        }
      }
    }
  }
}