Can you query children of the children?

[Alexander Rosado]

I am trying to JQL the children of the children with:

issueFunction in porfolioChildrenOf('issueFunction in porfolioChildrenOf('type = Theme')') 

This alone works: issueFunction in porfolioChildrenOf('type = Theme')

The structure is Theme->Epic->Story. We are trying to roll up all story points collectively connected to Themes. 

Is it possible to query that deep with JQL? 

The grandparents need to track all of their grandchildren.  We need a portfolioGrandChildrenOf()