Is there a way of seeing what "Incident - Additional Fields" are not being used in any Incident template?

Or is there a way to see what templates a particular "Incident - Additional Field" is being used in?

For instance, we are trying to clean up some of our Fields to get under the maximum your software allows of 90, as well as try to find fields that could be removed safely and know what templates it is affecting.

Such as if the field "Call Back Number" is removed, will it only affect one template or 30 Templates? This will help in our planning to determine if a field is necessary. Obviously we can go into each template and look and make a count, but this is becoming increasingly more difficult the more templates we build for our various groups.

It seems counter productive to have to manually figure out what fields are currently being used and where.

Any help is greatly appreciated.

Screenshot is attached to show exactly what section i am referring to.