More specific user permissions for Runway Collections

Does anyone know whether an editor role can be assigned to items within a Runway Collection? For example, if I have a Collection of Members and a Collection of Countries, I want editors to only edit Members in their Country.

I need to use Collections so that I can import data from an existing site.

Perhaps I will have to ignore importing and use a list-detail approach and a multi-item region assigned to specific pages, that's all I can think of at the moment.