I want know how many people wait to fix very important bug
The CC list size and Duplicates count indicate that. CC list is a kind of “voting”.
But in general, for a bug to be fixed, the “voting” is irrelevant. What is relevant is that a developer who is interested in the bug would appear. LibreOffice project is a community where nobody can force you as a developer to work on whatever you don’t want.
Well, you can always try to contract a certified developer or company providing professional support to fix your pet peeve bug for a certain amount of money.