Custom child button doesn't appear on issue operations bar

[Mário dos Santos _TOTVS_]

I've included a new button on transitions bar and would like to include another one as a dropdown, akin to the More button or Workflow button.
But, if I create the second button as an item of the first, it doesn't appear.
In this case I put the second item in the section of the first.

What's wrong with my approach or that is not possible?

 <web-item key="integration-actions" 
         name="Integration" 
         i18n-name-key="integration-actions.name" 
         section="transitions-all" 
         weight="1">
     <description key="integration-actions.description"></description>
     <label key="integration-actions-main-button.label"></label>
     <link linkId="integration-actions-link"></link>
 </web-item>
 
 <web-section key="integration-actions-comunicacao-cliente-section" 
         i18n-name-key="integration-actions-comunicacao-cliente-section.name" 
         name="Communication with Client section" 
         location="integration-actions" 
         weight="1">
 </web-section>
 
 <web-item key="integration-actions-comunicacao-cliente" 
         name="Communication with Client" 
         i18n-name-key="integration-actions-comunicacao-cliente.name" 
         section="integration-actions/integration-actions-comunicacao-cliente-section" 
         weight="1">
     <description key="integration-actions-comunicacao-cliente.description"></description>
     <label key="integration-actions-comunicacao-cliente.label"></label>
     <link linkId="integration-actions-comunicacao-cliente-link"></link>
 </web-item>