Horizon Analytics formulas to use aggregated metrics

One thing we’d like to do is build metrics based on aggregated data using Horizon Analytics (SUM:X / SUM:Y). Example:

I know the total amount of Success Plan objectives successfully closed-won (e.g., we achieved them) and divid that by the total number of Success Plan objectives closed in that same period (e.g., closed-won + closed-lost). From looking through Horizon Analytics, I don’t believe we can do that today.