Logged Work in Shapshot

I'm using the API to get snapshot data at different levels in our projects to report on remaining work over time but want to compare this to logged work over time at the same level (say a subfolder).

Is there a way through the API to query a roll-up of logged work over time at a specified treeitem (like a folder or project)? I can do this through with an Analytics report but it would require me to setup a new report from every folder/project I want to report on.