SUM all with label xxxx


I have the following data collected every 2m:

I am trying to graph the sum of all with label starting with RCC1, so i have tried:

from(bucket: "vsphere")
  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)
  |> filter(fn: (r) => r["_measurement"] == "RMF")
  |> filter(fn: (r) => r["description"] == "response time by volume")
  |> filter(fn: (r) => r["label"] =~ /RCC1/)
  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)
  |> yield(name: "last")

which displays all RCC1 values no problem, how do I total all values for each 2m period so as to produce a graph showing one line with the total every 2m?