Trial Balance or any other default Report - Add custom Button

Hi all,
I have searched the groups for a small extend on existing Query Report / Script Report …
I would like to add a Custom Button (Extend) to Trial Balance or any other Script Report .
To achieve (Exportar XLS) this i had to create a local Trial Balance (copy original) and add the button but i wonder if there is no other way like in hooks “query_js = …/trial_balance.js” to extend existing like we do with Docktype and other JS files.

Hi all,
Does anyone knows how to extend JS Report?
Need to add and extra button on Accounts Receivable.


There should be a better resource for this, but here’s some breadcrumbs: