Ability to request to borrow a resource from a team

An initiative can be assigned to one of more teams, each with their own estimate. Sometimes we need a specialized skill set (eg. a front-end developer) to contribute to that initiative for a finite duration (ie. one week).

We need an ability to request a resource by skill set. Once approved, that resource will be contribute that that initiative for that team for the required duration, and they won't be contributing to their original team's capacity.