I don't know why this should exist, but I made this.
group list
-------|------
00000 a.lst
00001 b.lst
00002 c.lst
00003 b.lst
$ export FS='\t'
$ export RS='\n'
$ cat item_group | tail -n+3 | from_stdin | filter x 'grep -e item1 -f $x2' | foreach 'echo $1'
00001
00002