List all files in a homebrew package

How can I get homebrew to list out all files installed for a package? For example, when I run brew list for the exim package, I get these files:

$ brew list exim
/usr/local/Cellar/exim/4.80.1/bin/exiwhat
/usr/local/Cellar/exim/4.80.1/bin/exiqsumm
/usr/local/Cellar/exim/4.80.1/bin/exiqgrep
/usr/local/Cellar/exim/4.80.1/bin/exipick
/usr/local/Cellar/exim/4.80.1/bin/exinext
/usr/local/Cellar/exim/4.80.1/bin/eximstats
/usr/local/Cellar/exim/4.80.1/bin/exim_tidydb
/usr/local/Cellar/exim/4.80.1/bin/exim_lock
/usr/local/Cellar/exim/4.80.1/bin/exim_fixdb
/usr/local/Cellar/exim/4.80.1/bin/exim_dumpdb
/usr/local/Cellar/exim/4.80.1/bin/exim_dbmbuild
/usr/local/Cellar/exim/4.80.1/bin/exim_ctl
/usr/local/Cellar/exim/4.80.1/bin/exim_checkaccess
/usr/local/Cellar/exim/4.80.1/bin/exim-4.80.1-3
/usr/local/Cellar/exim/4.80.1/bin/exim
/usr/local/Cellar/exim/4.80.1/bin/exigrep
/usr/local/Cellar/exim/4.80.1/bin/exicyclog
/usr/local/Cellar/exim/4.80.1/share/man/man8/exim.8

But there are files added to the system that is not in the list above. For example:

$ ls -ld /usr/local/etc/exim.conf 
-rw-r--r--  1 hanxue  admin  35904 Sep 25 21:11 /usr/local/etc/exim.conf

Just add -v or --verbose, for example:

$ brew ls --verbose exim

If the package in question is a cask install (e.g. mactex) then you'll need to include the --cask arg to the list/ls command e.g.

brew ls --cask exim

Note: With casks if you don't include the --cask arg then it often reports an error. And with the --cask arg it may only list the installer dmg as it doesn't seem to track the resulting installed files.