I believe that only works when you are using the URL to build the graphs/charts, rather than using the saved report. For example:
def=
{'time':'-1hour','rows':[
{'charts':[
{'parms':"...", 'series':[
{'sqt':'myserver|QOS_CPU_USAGE|Total','scale':'1','color':'8000','style':'line'},
{'sqt':'myserver|QOS_CPU_USAGE|User','scale':'1','color':'800000','style':'line'}
]},
{'parms':"...", 'series':[
{'sqt':'myserver|QOS_CPU_USAGE|Total','scale':'1','color':'8000','style':'line'},
{'sqt':'myserver|QOS_CPU_USAGE|User','scale':'1','color':'800000','style':'line'}
]}
]},
{'charts':[
{'parms':"...", 'series':[
{'sqt':'myserver|QOS_CPU_USAGE|Total','scale':'1','color':'8000','style':'line'},
{'sqt':'myserver|QOS_CPU_USAGE|User','scale':'1','color':'800000','style':'line'}
]},
{'parms':"...", 'series':[
{'sqt':'myserver|QOS_CPU_USAGE|Total','scale':'1','color':'8000','style':'line'},
{'sqt':'myserver|QOS_CPU_USAGE|User','scale':'1','color':'800000','style':'line'}
]}
]}
]}