Set Headers to be file name for all files (new and existing)

Hi guys, I tried to show the file name by enabling header. However since i always handles lots of document, it’s tiring to set it manually. Is there any way to make the header becomes a default setting? I find a way saying that we can do it by using templates (i.e save the templates then use it as default) however it works only for new files and not for existing files. I want to use the feature for my spreadsheet documents so that when i print it I do not need to double check which files are they.

Thank you in advance!

May I propose to file an enhancement request at: https://www.libreoffice.org/get-help/bug/?enhancement=yes

If you have ideas on how to realize it, you might be able to work even on the development. Have a look at: Get Involved | LibreOffice - Free Office Suite - Based on OpenOffice - Compatible with Microsoft