I’ve got a query that renders a timechart like so. However, how can I also plot on the same graph where customDimensions.["Is Successful"] == "True"?

customEvents
    | extend Product = tostring(customDimensions.["Is Successful"])
    | extend TransactionNumber = tostring(customDimensions.["Transaction Number"])
    | extend StoreCode = tostring(customDimensions.["StoreCode"])
    | extend TillNumber = tostring(customDimensions.["TillNumber"])
    | extend TimeStamp = timestamp
    | where name contains 'Transaction Posted' and customDimensions.['Transaction Number'] != ''
    | where customDimensions.["Is Successful"] == "False"
    | make-series Total=count() on TimeStamp from (startofday(now()) - 7days) to now() step 1d
    | project-reorder TimeStamp, Total
    | render timechart