Is your feature request related to a problem? Please describe.
I have a custom column called pages and i would like to search for books in a range of pages. Eg. A book between 250 and 350 pages.
There is already a field for the custom column called pages in the search and it knows it needs to be a number, but searching for an exact number is not useful in this case.

Describe the solution you'd like
Similar to the published date bi propose to have a from and to field in the search for numeric custom columns

Describe alternatives you've considered
The alternative i have to use calibre to search for this cases but that is not possible if I‘m not at home