Unmovable lists for a template?

Hi, i am trying to make a template with a list of line numbers in the document, to help keep track for poetry.
This seems easy enough but when i need to delete a bad line, it sometimes deletes the number too, messing up where all the lines should line up in the verse. Is there a way to make the numbered list a “permanent” part of the page, or rest in the background as a watermark or something so when i delete a line of bad text, "15. " will still be there waiting for the new text instead of disappearing and sending careening number changes down the list?

Thanks for your time :smiley: