You can use a tilde to represent home folders. If you make an entry for ~/Applications then it will catch apps in every user's Applications folder. Unfortunately, they will all display in Jamf as "~/Applications/whatever.app", so you will not know which user has which app without further inspection.
If you have a standard user name (in a computer lab, perhaps?), you could also use the full path, /Users/johndoe/Applications . You need the leading slash for absolute paths.