Ideas for Atlassian Apps

Use case: 
I use another add-on which enables me to create page trees based on a template by clicking a button on a page.
I have a button which creates the childpage "Installation protocols". 
I would like to hide this buttonmacro as soon as the page "Installation protocols" is existing as a child of the very page I use the hide-if macro on. 

So in simple: "Hide if child page with the name xxxx is existing"