CRM - search for contacts in the root group

It's possible to define contacts for each group (no matter in what level of nesting).

Supposing I have group/project structure:

* group
  * subgroup
    * project
      * issueA

When using /add_contacts foo action for adding a contact to issueA, foo contact is searched only in the project's parent group (subgroup), but not in other ancestor groups (group). It would be nice to be able to add contacts from all ancestor group contacts.