Found the solution here it is for anyone else who needs it or will need it
in future:
initialize()
cAttr = OpenMaya.MFnCompoundAttribute()
cAttr.create("compoundArray", "cArray")
cAttr.setArray(True)
cAttr.setUsesArrayDataBuilder(True) // gives the main functionality for the
array of compound array
compute()
inputArray = dataBlock.inputArrayValue(cArray)
outBuild = inputArray.builder()
for i in range(0, n):
outBuild.addElement(i)
inputArray.set(outBuild)
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