I am guessing this is what you are after (?).
I have changed some details:
- File name your content template org file
- Target file name.
- Removed URL property (I thought you’d manually enter it anyway).
(add-to-list 'org-roam-capture-templates
'("b" "Literature note (book or article)" plain
(file "~/tmp/lit.org")
:target (file+head
"lit/%<%Y%m%d%H%M%S>-literature-${slug}.org"
":PROPERTIES:
:Author: %^{Author}
:Release_year: %^{Year}
:END:
#+title: %\\1 %\\2 %^{Title}
#+filetags: :literature:")
:unnarrowed t))
The content of file ~/tmp/lit.org
is as follows.
# If I have the numeric copy of the book, attach it
** Synopsis
%?
** Notes
# Use Org-noter if numeric book is attached"
Did I capture what you want correctly?