The question is simple. Let's say I have a story with issue key 'STORY-123'. Given this, using JQL, I should be able to find the portfolio initiative this story belongs to. In the same way, need be, I should be able to find the portfolio stakeholder this story belongs to.
There are a multitude of solutions to find the children given the parent, but this is tricky since we have to find the second/third level parent of a given issue.
Story -> Epic -> Initiative -> Stakeholder