Show EBS usage over time

Hello splunkers! I'm wondering how I can show a dashboard calculating EBS volume usage over time. And possibly into the future. This would be a very handy dashboard. at this point im trying to derive from Im working from this point `aws-description-resource((aws_account_id="*"), (region="**") , "ec2_volumes")` | search status="in-use" | stats sum(size) as size | nadefault size | `volume_size(size)`| trendline sma5(size) AS smoothed_foo ema10(bar)