how to add custom item under Page Information tab?

See this location 

/libs/wcm/core/content/editor/jcr:content/content/items/content/header/items/headerbar/items/pageinfopopover

It has all the items, try adding your custom option, dig little more into this, I ll also see if any there is anything else .. I ll update here

Hi @keehwan1 

  you can refer this  http://experience-aem.blogspot.com/2018/09/aem-64-touch-ui-add-view-in-publish-to-editor-page-info-dropdown.html for adding new item under page information Tab. And if these items needs to be rendered based on some condition than you can use granite:rendercondition . 

you can refer : https://levelup.gitconnected.com/aem-creating-custom-granite-render-conditions-28a21958f420 for adding custom render condition.

Thanks

Dipti

@keehwan1 Please refer to below article URL:

http://experience-aem.blogspot.com/2018/09/aem-64-touch-ui-add-view-in-publish-to-editor-page-info-dropdown.html