when using "Search in rules" for an object, do a recursive finding.
service svc1 is 22/tcp
object svc_grp1 contain svc1
rule #1 : svc1 is used
rule #2 : svcgrp1 is used
when searching in which rule svc1 is used, it will return rule #1 and rule #2.
N.B. : It would be nice if such recursion can be an option when requesting "Find in rules" action.
P.S. : API as category may be wrong. Don't hesitate to update category if needed !