How can I add a JsModule in another without touching java file?

Flow
1

I have a page with 3 tabs:

<vaadin-tabs style="align-self: center;" orientation="horizontal" selected="{{page}}">
  <vaadin-tab selected>
    Home 
  </vaadin-tab>
  <vaadin-tab>
    Products 
  </vaadin-tab>
  <vaadin-tab>
    Users 
  </vaadin-tab>
 </vaadin-tabs>
 <vaadin-vertical-layout class="content" style="width: 100%; flex-grow: 1; flex-shrink: 1; flex-basis: auto;">
 <iron-pages selected="[[page]
]">
      <div>Page 0</div>
      <div>Page 1</div>
      <div>Page 2</div>
    </iron-pages>

So now I want to include other JsModules inside the divs of iron-pages, how can I do that?