Feature request - Track field usage

I would like a feature that allows me to track if and where a Field is used without requiring me to open all templates an manually look for the field. 

If I go to Settings -> Fields and click the Settings-button, I would like to have an "Where used" option along Edit and Delete. This should give me a list of templates where the given field is used. It would be nice if I then could click a template in the list and open it directly from there.

Alternatively an advanced search filter allowing me to search for field(s) used in the signatures could be an option.