Libreoffice Calc in Linuxmint. How do I get the full address of an .ods file to show on the Header Bar?

[trespidian]

I need to show the full address of the calc file on the screen not just the file name.

[mariosv]

There is an old request for improvement.
Show current file name AND path in titlebar

You can get it in a cell with the function
=CELL("filename")