Selectively share one objective w/o sharing whole plan

Our customer has made some plans private and then shared them with selected teams. Then, they added other users (not part of the team shared w the plan) as contributors. Consequently, this shared the whole plan with those contributors. However, the customer would like to share only that specific objective to not reveal the whole plan to individual contributors and create further clarity to those contributors/owners that only intervene on selected items in the client's overall strategy.