Directly relevant or Directly-relevant?

I am trying to label a graph with two terms. “Directly relevant Environment” and “Indirectly relevant Environment”. These two terms are meant to describe the collections of factors that directly and indirectly relate to the operations of a company.

Should I use hyphen before the “relevant”? Also does it make sense to label it that way or would I need to use “Directly Relevant Stakeholder Environment”? In other words, should I include a subject for the title to make sense?